I recently bought one off amazon, (3 weeks ago) just starting to notice a few problems, first is with google earth, while scrolling around all of a sudden the globe will just start spinning into oblivion, very annoying, secondly, occasionally just after waking up the clicks will not work, I either unplug and reconnect the receiver dongle or wait and it will sort itself out after a few moments. Also the left scroll button needs a lot more pressure than the right, I hardly use the horizontal scroll so could live with it, but I am interested to hear if anyone has had similar issues before I ask for a replacement.
Cheers,
Dan