I still have a Quantum 40 MEG drive that works fine. Yes, 40 MEG, not Gig.
Hence, I have always bought Quantum drives. I have not lost one. There was one model years ago around the 850 Meg size (if I remember right) that had a high error rate, but other than that I've always found Quantum drives to be high quality. I worked hardware support, and then network support for many years.... so I have a reasonable amount of experience to base my opinion on. I still buy Quantum. They are not always the fastest, but they have always proven to be good quality reliable drives for me.