I also have the d-link 660w, but I\'ve had a completely different experience with it. I\'ve not had a single problem with mine, and I\'ve had it for about 6 months now. I use it daily, and leave my Z on with it for hours at a time.
Maybe I got lucky.... then again, I also have a 128mb Sandisk SD card, and have never had a problem with it (while many others have).
I first had the d-link 650w, but that model was quite large, blocking both the stylus and the headphone port.