I've only run one Gatorback belt. That'* the one on my 99. I installed it at 77K, and I'm at 168K...so it'* been on for ~ 91K miles. Still in great condition.
However, I hate the fact that it'* so noisy. It whistles very badly and is ANNOYING. Thankfully, the noise drowns out at highway speeds, but in the city (especially with the windows down) it'* just irritating. I'm too cheap to swap out a perfectly good belt, so when it finally breaks or gets worn, I'll put in a Gates belt. IMO, Gates belts are GREAT.