Mid-April 2013 I got the mouse at first everything looked good (except that you could use the mouse on a sofa or bed bad subsoil, which was sometimes a bit annoying). The first impression would therefore certainly brought 4 stars, but the beginning of August was then already the first pair AAA batteries empty. That the batteries do not even keep 4 months, is incomprehensible for me, I had already mice with several years without battery replacement. FYI: I used the mouse for about 4 hours daily and have always exhibited, if I did not need them (especially at night, etc.).
Of course I firstonce inserted new batteries and the mouse ran again: for about 2 weeks. Then the mouse was phased out: 30 seconds, 10 seconds. So defective because new VRLA have changed nothing.
Conclusion: Stay away from this mouse, good four months life is daily at 4 hours using the worst mouse I've ever used. Previously, I had a mouse from Cherry that has kept at least 1 year, which I think is also far too little. So I'm going back, etc. more money in Logitech set.
