I like it, the battery probably lasts as long as my old MX1000 did which was 3-4 days of use.
The old MX1000 started to get very hard to charge properly, the slightest knock would stop it so this was the reason for getting the G700.
I've been using max gaming power setting and a report rate of 1000 since Thursday and it has just a few minutes ago gone critical.
I'm not sure how many hours this is but I'd expect between 11-14 hours if I roughly work it out.
I find the battery light indicators goes from 3 to 2 to 1 fast but it takes far more time to get to critical.
I don't find it an issue when it does run out of power as the USB cable doesn't bother me as much as I thought it would.