You plan to use it like an "iPod touch" right? 2gb of ram with android 5.0 is a bit old imo.
Hiby R6 will be probably nice and smooth for browsing, mail, YouTube, etc although it's obviously isn't designed for it.
Cutting edge equalisers, digital filters, etc. You can fine tune the sound to your liking in ways that has never been achieved before, is, imo, what makes this DAP really intriguing to me. It could potentially sounds good with virtually any earphones
The only issue is that, as of now, only a couple of professional reviews are available with no real downside pointed out. Either you take the bet or wait for the first wave of buyers to get a broader view of what this thing has to offer.
The pioneer use sabre dac, it suppose to match better with warm earphones. I don't think it's a bad choice at all but haven't tried.