This isn't reddit or headfi. You don't get downvoted off the island or banned for telling it like it is. Don't waste you money on an expensive interface unless you want to drop at least a few hundred on a decent pair of speakers. If you think that bass guitars and kicks really sound anything like how the high impedance Sennheisers present and blend them on the recording or in real life, then lol listen more. The 600 and 650 sound nothing like speaker bass from anything halfway decent. The bass on those cans is a warm, distorted mess that's so rounded that it is disjointed from the rest of the sound and bleeds into the lower mids. Most other cans are just horrific and those are cheap. Expensive interfaces whose main benefits are cleanliness and low latency performance uber alles are total overkill for them alone. The biggest benefit to dropping some benjamins on one is that it will show you what is holding back your setup: headphones. Even some of the mid priced brands like audient and presonus that are better than the cheapest two channel focusrites and steinbergs are good buys. Most headphone hobbyists will never use the inputs for anything other than gaming and will end up with stuff like KEFs, iLouds, or some of those horrific single driver horns if they even buy speakers to listen to Spotify, play Fortnite, showing off interesting stereo effects with hundred dollar DCC and Chesky test discs, and anime. No CDs, no LPs, no folder of five thousand FLACs. Yeah nil benefit.