I dont think it is, Phil does and I know what he means cause with the C5 and BB on, you'll loose detail and clarity, but get warmth and bass. To me it depends on the music I'm listening too and the quality of the mp3s, but I can appreciate the C5. The DZero is more neutral, I like it as well, but you won't be able to get the extra bass.
I'm actually surprised to see people complain so quickly (like for example one week in the same stage) and there's almost no mention of all the positive things CE is doing, their customer service is exceptionally good.
I ordered 1964 V6 Stage at the end of september, only thing I heard was they received my impressions... am I worried, no. Just don't pressure these companies, they're doing a great job. Patience is a virtue
I'll definitely won't use the bass boost. But people usually find the C5 to sound very resolving. I would still like to test the D-zero though, the thing is, people from iBasso commented on the internal amp of the DX50 vs the D-zero. And they like the internal amp from the DX50 better. But when I hook up the LO of the DX50 to the O2, there's a pretty darn big improvement. I lose quite a bit on dynamics and clarity on the DX50's HO with the BA4f.
That's why I also commented on the people who kept asking what each stage meant. Just don't look at the stages honestly, it'll be there soon enough.
Cool that you ordered the V6! Have heard pretty amazing stuff about it.