Pros: Powerful, Small Factor, Excellent build Quality
Cons: Sounds Processed
I've been reading so many replies and reviews how the O2, Magni and Vali sound the same. After weeks of listening to all of them, (yes I have them all) they are all not exactly the same . I've been using the same music and all else in the system is the same and have only changed the amps. Started with O2, then went to Magni. Yes the Magni and O2 sound very close. The Magni does sound a tad processed and thin compared to O2 but the Magni does have more authority as it is more powerful in comparison even though they all seem to struggle reproducing the source.
Then I went to the Vali. The Vali sounds nothing like the others. It's slightly more smoother and warmer, more of a natural sound but ever so slightly, and more realistic sounding. I was enjoying it very much for weeks but the Vali also seem to struggle reproducing the source which makes sense as it's less powerful than the others.
As for noise (hiss); No hiss at any volume level connected to a source with HE-400, so if you have higher impedance headphones there should be no worries. It drives IEM's extremely well with no effort, but larger headphones it just seems like it's trying too hard.
I hope this helps anyone who maybe interested in the Magni.