I’ve had the OG Bifrost MB and Eitr. It’s pretty good. I had the OG Gungnir MB and sold it. I ended up wishing I hadn’t sold it, and bought a BF2. Short answer is the BF2 is a very worthy replacement to the OG Gungnir Multibit, and I prefer the form factor. I run both the SE and balanced outputs into my Jot2. It allows some bit of adjusting the signal level coming into the amp. I can’t tell a difference other than volume level between SE and balanced. The SE to me is better than the OG Bifrost. Whether it’s $800 less the sale proceeds from your BF better is another story entirely. regarding Unison I find it better then Eitr. I frequently use it with an iPad source with Apple Music, which should be kind of puked, but it’s actually pretty darned good. My main source is an Allo digi+ signature - another flavor of Pi2AES type board. grain of salt warning - I’ve had the BF2 less than 6 months, and I tend toward new toy fanboy.