I've always found it to be great. I move it around a lot and take it to friends houses and such and it's fine. It just makes a loud noise when TM is backing up.
Maybe you got lucky
Both of mine have a glitch where the powercord is plugged into the drive, its to much of a travel in the adapter so it tends to turn itself off, the same with the USB cable, it tends to get pushed into the enclosure so i have to fetch it from time to time, and there is some other minor issues. Gonna order a WD mybook to now that the prices have dropped.
(its to late to write in proper english, sorry )