Returned my Atrix HD today
I gave it 2 weeks and wasn't happy with it. I really wanted to like this phone.
The battery life is horrible, even with JuiceDefender - if you're off wi-fi and use it at all you'll need to recharge by late afternoon.
The camera is hit or miss, and very noisy in low light.
Wi-fi drops even with a fairly strong signal - I see it switch to 4G and the wi-fi symbol disappears, then it comes back and reconnects, but it does it repeatedly if you're not right next to the router. My Captivate has better wi-fi.
The pluses for me were: screen, speed, design, grip, notification light, ICS. But it wasn't quite enough.
The One X is supposed to be $99 tomorrow (don't know if that's a permanent price drop) but I'm thinking of leaving AT&T anyway.