I'd go for the IBM. I had a 30 gig 75GXP for a while, but my computer got stolen around Christmas. When I bought my replacement with the insurance money, there were no IBM drives available, so I went with a 30 gig Quantum. It's a good drive, but not as fast as my old IBM. Sandra benchmarks still show my old IBM beating this one. In my opinion, if you have the opportunity to get an IBM, do it; you won't be disappointed, but if you did get the Quantum, I'm sure you'll be happy too.