I tried this mouse for a couple of days, but decided to return it, the product is just a bit to lacking.
(Little bit of history i've used the mx510, 518 and G5v2)
The biggest mistake i found on this mouse is the position of the laser, being it near the fingertips like a G9, its not really a good replacement for the G5 where the laser was more to the middle. The new location of the mouse makes it a fingertip mouse, and the mouse is rather large to use this way.
As a user who allways worked from the middle i had pains in my shoulder and elbow in under half an hour, becasue i needed to swivel the mouse arround more, its not so noticable in FPS games, but it is in RTS and RPG games, where you often have to use bigger movements.
Also now we have 3 thumbbuttons, while the this looks nice, their is one small problem, the buttons are all close together wich can make it hard to deferiate between them. Also if you have a large thumb, you risk touchimg, the middle one without meaning to do so, you can ofcourse disable it but this would defeat the purpose of there being a third button.
Now to the new mousewheel, i must say i prefer this to the one used in the G5 is a bit flatter on top, so you middlefinger actually rests better on it. The down point from the wheel however is that the side tild is way more sensitive then at the G5, only a little nudge (1mm) is enough to press it, so i ended up disabling these aswell, since everytime i so much as tried to scroll they reacted.
Now ofcourse there are also some cons to this mouse:
The big + on this mouse is the new thumbrest, making it much more comfortable then the previous models.
Also the positioning of the DPI buttons to the left is a good thing easy to press, not in the way.
The grip off the mice is good its large enough, and the sides feel rugged again, like they were at G5v2, personally i would have liked the top to be more rugged like the G5v2 aswell, but that just personal taste. Maybe this can be solved by changable covers on the next version, just like present now on the G9x.
Weight is pretty much the same as in the G5v2, i weighted these mouses, and they both weigh 140grams without cords. Also the G500 futures changable weights like the G5, allthough you can fit 2 less in, in my case thats not really a problem, but some people would might like to add more.
So to conclude, allthough it grips nicely, 3 of the 10 buttons are unusable making it a 7 button mouse the placements of the laser, makes it a fingertip mouse so its quite heavy to move in this form. If things like thse dont botter you, or if you are a user who switched from the previous models to aG9 i can only recommend it, if you dont like the fingertipcontroll, i reccommend you wait till the next version of this mouse is released.
Technical Expertise: Tech Savvy
I've used this product: Less than a week