So, I picked up a Magni 3 and have had it playing music for the last 24 hours or so (seemed to stabilize within an hour, honestly). I was curious about how it sounded based on the comparison provided by @a44100Hz, as I can't comment on something I haven't heard myself. And I've heard so many good things about it, so what if it was a truly better amp? But, frankly, I also needed a better SS amp for headphone measurements. I'll preface this by saying the Magni 3 is a fantastic amp, and not just for the price. But I also have to say I find a lot to disagree with in @a44100Hz's comparison of the two amps. I don't know if the stock tubes just don't have enough hours on them, both long-term burn-in and warm-up (yes, these Russian tubes take a lot of time to burn-in, as I easily ran mine through 100+ hours before I listened for review, and a good hour to sound their best for warm-up after burn-in), if something isn't quite right with that loaner unit (though I hate to be that guy that says, "If someone doesn't like it, the unit must be bad."), just a misfire and misunderstanding of terminology, vastly different music choices that highlight different aspects of the amps, or totally different hearing, but the fact is I can't agree with most of those findings. In fact, the two amps sound rather similar to me if painting broad strokes. The Magni 3 is very balanced, cohesive, and smooth in the mids and treble. Just awesome for a SS amp. More tube-like in tone there. But it's a little full sounding in the lower end. It's a slightly warm and bassy sounding amp. Thankfully, I like this. It has good extension and a good sense of oomph in the lowest octave. Now, even when running the stock tubes on the ZDT Jr, the ZDT Jr flat out has better resolution, liveliness, and less dynamic compression in the mids and treble. For example, panning drums across the stage sound clear, full, and detailed on the Magni 3. You can even hear the reverb in the room, even. But it all sounds somewhat muted relative to the ZDT Jr, as is common when comparing even the best SS amps against a good tube + OPT coupled amp. The ZDT Jr in comparison has the same level of detail, greater air around instruments (the sort you can "feel" rather than hear, a very important distinction), is snappier and livelier sounding, and actually gives you a glimpse of drums in a 3D space rather than on a 2D plane, the ability to better visualize and almost touch them. That's the sort of resolution and a tangible nature you just don't get on the Magni 3 when compared to the ZDT Jr. Or, for example, those sparkly, shimmery, whooshy noises in the beginning of "Lost Yourself To Dance," which I'm not really sure how best to describe or what to call them, swim and play around your head on the ZDT Jr. It can almost trick you into thinking something is floating around you. The Magni 3, in comparison, is more just about hearing those things. I hate saying stuff like this, really, but the ZDT Jr. brings out the ability to tangibly feel elements in music, whereas the Magni 3 doesn't go further than letting you hear it all. As another example, you can feel the low-pitched pulse of air when someone presses down on piano keys and the pedals below on the ZDT Jr. On Magni 3, you guessed it...it's audible and clear, but it's not tangible. It is relatively muted in comparison. This is the sort of magic you get from a good tube + OPT coupled amp versus solid status (or less tube amps of any kind). The Magni 3 has a slightly more laid-back stage when volume levels are matched. At first, this gives a greater sense of staging depth, but when you peel the layers back, it follows that while the ZDT Jr. is a wee bit more forward, its more 3D nature can only come from a finer gradient of layers from front to back. And, yeah, the Magni 3 is a hair wider sounding, but I would argue both amps trend more towards sounding a bit forward and intimate than they do spacious. You have to pay big bucks to bring this trait out on an amp without sacrificing other areas. Both of these are budget amps, respectively, and need to be looked at as such sometimes. I also think claims of poor bass quality from several reviewers are over-exaggerated. When comparing the intro to "Lose Yourself To Dance" or the bass drum on the live version of "Hotel California," the Magni 3 is only marginally better sounding in overall bass quality. I guess you could say neither amp is stellar in this regard, but I would argue both amps are more than serviceable in this area even despite their slightly warm, slightly bloomy nature on the low end. They're actually kind of similar in this area. It's tough getting that lush, full, bloomy sound without also sacrificing bass quality (again, big bucks required to have it all). The only time I've really heard the ZDT Jr sound anywhere near poor in the lower regions was when using tubes without enough burn-in and warm-up. Depending on those factors, I've heard the amp sound anywhere from ultra lean to ultra bloated in the low-end until it sort of finds its way. If i will give one nod to the Magni 3, it does have marginally better extension and oomph in that lowest octave. But you really have to listen closely to hear it, and both amps make the HD650 sound dynamic and full. For most music, those lowest octaves are underutilized. And, remember, too many amps make the HD650 sound lean. I really don't mind the stock tubes on the ZDT Jr. They are rather lively and somewhat aggressive, but they need a lot of patience and time to settle down and open up, so to speak. I honestly don't know how much time they've been given to do so on the tour, but it's easy to wave my hand, brush it off, and make that as the excuse for what people hear, I know. Yes, vintage tubes like the GE 5654W alone bring about noticeable improvements to the ZDT Jr, making it sound a bit more lush and better extended without increasing bloom, further improving staging abilities, better resolution, and so on. But the amp inherently keeps those special traits that come from a well-designed tube/OPT coupled amp regardless of what glass you stick in it. This is also not to say that someone can't prefer the Magni 3's sort of sound. Some people just dig that. I know myself and many others are set on a good tube + OPT coupled amp. Some just won't get along with that sort of sound. Some can't get on with it unless dealing with mega-buck amps or very particular implementations. Same reason I don't always get on well with solid state amps or oversampling DACs. At the end of the day, though, I can only offer my honest thoughts, just as @a44100Hz does the same. Just as we might not have heard the same things, I'm sure we won't reach 100% consensus either as more people hear the amp. I'm sure we'll get opinions that don't match either of ours. That's just how it goes, and why it's important for everyone to sample a variety of gear to figure out what they like best.