To be honest, its probably the most rifle Ive been behind. Im a big thumb shelf fan and the JAE is perfect in that regard. The palm shelf is great, build quaility is top notch - I honestly struggle to think of anything that Id change as far as the ergonomics. My shooting buddy is pretty anti-chassis, and even he admitted it was really nice to get behind.
I keep finding little things I like about it - I didnt opt for the quick detach cheekpiece option, but even then its simply a case of undoing two bolts on the top and popping it off - makes cleaning a breeze (rather than screwing down the cheekpiece on the McM A5). I also really like the fact that ill be able to buy a long action collet and swap it around if I feel that way inclined.
If it was a little bit lighter, I dont think anyone would really be able to fault it.