I recieved my XIM4 a day ahead of schedule and the box was in PERFECT condition. so, although I know some people's box was roughed up, fedex was gentle with mine, and a day faster than expected....so they are good ppl by me.

First off, I've only used it with TLOU.....but I feel that kind of game is going to be the test. of course CoD and BF will work great. also, I've been using XIM since XIM3's launch, so thats what I have to compare to.
The physical product
Great form factor on this guy and very small. Great things come in small packages they say. The LED's que you in on what it's doing, that's nice. I like that you can assign a different color for different configs. Thats quite handy. The insturctions are as good as they can be and everything went super smooth with the first time setup.
Andriod App
Here is the winner. winner winner chicken dinner. changing my binds or sensitivity while I test out the game? perfect. Coming from xim3 and having to put it in PC mode, download the lastest mananger, hook it to the PC, etc, etc. Makes the entire process and absolute joy. adding and editing configs is so much better than the XIM3 this way.....oh how far we have come. this is the absolute highlight for me.
Compatability
I'm using a filco tenkeyless and a zowie EC1 eVo and they work just fine. Yeah, the scroll wheel doesnt work....but I hardly ever use that anyway. I normally use the mouse to aim and shoot, and thats it. Using 1000hz polling and 2300 dpi. smooth as butter.
Mouse
tracking with TLOU ST is as smooth as I've ever experienced. didn't notice jitter at all. coming from mostly halo ST's (and a G500), I'm used to a certain amout of jitter. not sure if that's due to the xim4 or the zowie...or both. feels absolutely great. I didn't even mess with the sensitivity the first match and I didn't miss a headshot. since then I've left the hip at the default 40 and took the ADS down to 25. then easily tossed the spot command on a side mouse button, and switched up the d-pad binds. all while in the middle of a match, I love that.
I was never too confident about using mouse and keyboard for a 3rd person game.....SOLD. Will try BF4 and ghosts tonight.....IF I can't tear myself away from TLOU. that MP is addicting.
Great product once again, and by far the best yet. Great job to everyone involved. Now.......I'll be waiting for the master chief collection like this: