I received my AM last week (alongside with my mechanical keyboard). Lovely mouse. Tracking seems very good. Shape is not perfect, but alround never is, with that in mind I think the shape is very good. Good for palm, fingertip and claw (probably best with claw, which I tend to use with the AM and I never really was a claw grip type).
Basically I think I'm a mixed grip type. I swap between the fingertip and claw (usually it is the process of moving the mouse forward or backward), but mostly do not touch the back side of the mouse with the palm, though occasionaly I do and I like the feeling of having something in the hand. The CM Spawn felt a bit uneasy with it's shortness, even if I barely touch the mouse with the palm. I guess this is where an allround shape is a win. If you are 100% palm, then you will be a bit disappointed (go for the Deathadder then, in trade for worse LOD).
Build quality is nice. After a week no shacky buttons yet. I have the best grip with glossy sides (Deathadder is like magnetic to my skin), but I do like the feel of the rubberised sides with the AM.
I love the wheel, perfect click, good scrolling. The wheel doesn't sit straight though, the gap at the right is wider than on the left. Not a dealbreaker, but not nice.
I also love the fact that the red wheel is slightly translucent and the red led light of the sensor shines through. I can easily find the mouse in a pitch black room on a pitch black mousepad. Though I wish the wheel was even more translucent and would glow slightly brighter.
The buttons. M1/M2 do not touch for me. Can someone who received his model from Caseking.de confirm? Perhaps it is the 2nd batch afterall? I can make the buttons touch, buy pressing them in the most unnatural way, something I didn't even think about doing, not before I read about that issue on this forum.
The HUANO's are quite stiff. I got used to it, but ultra-fast double clicking brings errors sometimes. I wish the click was lighter. Someone who plays games where you need to click the buttons at the most inhumane pace, I'm not saying stay away from the AM, but try it before deciding to keep it.
Click sound is nice though, fast and sharp. A bit to loud for my personal taste, but all mice are actually.
Sidebuttons are not as comfortably usable as the Deathadder/Imperator. My style to actuate the M4 button is with the thumb knuckle, while the M5 button with the top side of the tip. With the AM I need to move the thumb all the way to press both side buttons with the actual tip of the thumb. Not a dealbraker, but not the best design for me either.
AM glides well on my Qck (wow, didn't even try on the ultra smooth Propus yet).
All in all a very good mouse. Played through Half-Life 2 with it and it was a gread experience (both, the game and the mouse).
Only time can tell now if there will be problems with it or not.