For gaming I use

It's nice with the changable grips, but I kinda prefered the shape of the MX510 I had before.
However it has the microgear wheel... reason alone to keep that one :p
The on the fly DPI change is nice too, so is the profiles storage (practical with more than one comp at home)
the only thing I dislike are the side buttons... not very special...
If I had to choose a new one i'd take this one again though... just because of the wheel =)
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