Very good impressions on the AX35 through the first hour. I normally can't stand single BA sets, and the R-50 was way too harsh and shrill for me. This is my favorite in-ear with a BA unit to date.
I liked the clarity of the A161P/Somic MH407, but single BA's just don't have enough bass for me. The AX35 slaughters the Hisoundaudio BA-100 too.
As far as being labeled neutral, it isn't. The main review of the AX35 here on Head-Fi mentions "huge" bass. I disagree with that. It is nicely lifted, but far from being powerful. The Piston has more impact. The lift is just the right amount that I don't need to add any extra boost of my own, which is perfect.
The signature is a slight V. I would have preferred actual neutral, but the slight V works. Vocals are clear and present. Imaging is spot on. They scale with better recordings, and point out most of the flaws in crappier ones. Some rock music can get slightly shrill on distorted guitar parts, but I expect this to improve a little with burn in or the right tips.
They seem to work best using triple flanges and shoving them deep into your skull, a la Monster Gratitude style. The stock silicone is meh, and the stock foam is ok, but it dampens brightness, so treble lovers might not be into them. Going to try hybrids and bi flanges later.
A comparison between these and the Inearpeace or the Dunu-1k would be nice. If they are on par withe the IEP, at $68, they make the IEP irrelevant at twice the cost. Initial assessment... they are worth up to twice the cost... so far.