I've put my 1640 through a ton of use between burns and scanning, although I don't use it much for ripping anymore. I've only had a couple of oddities with my drive, on a couple of occasions the drive would open and close about twice as fast as normal but restarting the computer resolved it. It's probably in some way related to some of the other issues mentioned in this thread, but it's only been a very minor issue for me.