I love my G7... it is the only wireless one that I could use. It has the same sensitivity as the G5 and the interchangable rechargable battery is great. Takes me a second or two to switch the battery out.
Yea, I know there are a lot of other good controlers out there; for me Logitech is all I look at any more!
BTW- I love the G19 also... just got it so still getting used to it (but had G15s for a long while so not that huge of a difference).
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