Guess I could give you some initial impressions after the first few days.
Size: Omg, tiny! It's really short and more narrow than full-sized mice so if you like to palm grip your mouse you probably won't be too happy with this one. I'm using claw grip all the time so it fits pretty damn well. The angled sides offer good grip for lift off's.
As stated earlier it's rather light, weighing roughly 100g with batteries.
The main mouse buttons require very little force to press. I'm still getting adjusted to this so sometimes I accidentally hit mouse2 in the middle of a shootout. It's getting better though so I won't complain here.
The wheel feels solid and offers enough grip, pressing it requires too much force for my taste though.
The shoulder buttons are not really good. They need to be pushed pretty far in, to trigger action and are placed too high. Especially the one on the right side requires some finger-yoga for me to press ingame so it's basically unusable. Time will tell if I get used to that.
Currently I'm using a Puretrak Talent and the combination just feels like a winner. Overall I'd say silky smooth is the best description here. I've also tried a hard surface such as my Vespula but it feels rough with this mouse. It's probably because the mouse feet are rather tiny too. So far this one has had zero tracking issues which feels kinda like my very personal nirvana after all the hassle with my Mamba.
As stated everywhere it has no noticable lag. It's constantly on wireless mode so you need to have the little receiver plugged in all the time. Even if you charge it via USB you need the receiver if you want to use the mouse.
Signal strength is okay for Notebook use. With distances >2m I've had some dropout issues so if you have a whole living room to cross you might run into problems.
Well it uses standard AAA Ni-mh batteries which you could charge while gaming if you plug the included mini USB cable. From my impressions using the included cable nets you massive drag at the front of the mouse, probably because the cable sits too low. The plug has an additional glide pad at it's bottom but that doesn't really solve the problem. I'd rather use a set of spare batteries and an external charger.
When power runs low, you might get response problems or short dropouts. I haven't paid much attention to the glowing light between the buttons but I think it flashes faster, when the batteries deplete.
After a few minutes of idling it shuts down to save batteries. When that happens you need to hit some button to wake it up again. This might be an issue if you do massive camping
Well it does what I need it to do. Haven't tried the EasyShift function yet so I can't comment much on that one. Funny enough the default settings for me were for left-handed people so I was confused at first.
You can set the mouse to left and right handed mode so mouse1 and 2 are swapped but you cannot bind any other buttons to those two unless you use EasyShift.
Overall this thingy feels really good and so far every game of quake has been a good one.