Okay, so I just got my BGVP DM8 yesterday evening and there are a lot of good things to discuss.
First off though, I thought I'd get the one negative out of the way. I got the clear acrylic version and there seems to be some rattling going on inside the iems (both left and right) when lightly tapped or moved around. So far nothing seems broken inside, but it doesn't give me huge confidence about the build. I would probably go for wood one since the build seems to be more premium. The bores are also pretty large, but they provide a nice selection of tips so I was able to find one that fit comfortably.
Second, the tuning itself is pretty good, but nothing mind blowing. It seems like BGVP went with a pretty safe tuning overall, with some nice mid-bass and upper-mid lift, but nothing at all offensive in the treble or mids. Some roll off in the deep sub bass and upper treble for sure. But I think most people would find the tuning favorable and pretty easy to listen to. Keep in mind that I generally favor harman curve tunings.
Now the best part of the BGVP DM8 in my opinion are the technicalities. Not sure how much of this is related to advancements of BAs in general, but the technicalities are stellar and especially for the price. Soundstage, texture, layering, separation and transient are all superb and jump out at you straight away. A previous poster on here said these were better than all the Fearless S8 series, and I would agree, definitely on the technicalities and the tuning is pretty similar but a little less hot in upper mids, so it would depend on what you prefer. Also they are extremely coherent and natural sounding for a multi-BA setup. Everything just come together very easily and sounds correct. BA timbre is obviously still there, but the vented bass drivers help a lot in making them sound more natural and the inoffensive tuning helps remove any metallic timbre from the equation.
Having had DM6, DM7 and now DM8 there is a clear progression, but the DM8 is the biggest leap in the series. I would like to have a DM6 to compare with just to observe how far they have come.
Overall, I haven't heard anything under $500 mark that would compete with these, so I'm sure these will become a fan favorite in the near future once more people get their hands on them.