And that's fine, your experiences were clearly good. Meanwhile, mine consisted of a BSOD about "FXMEMMAP" or some such and all the games I tried to run supported Direct 3D / GL well where the 3DFX ran slow and often didn't render properly. It also consisted of people nearby bringing me their machine if someone had fitted a 3DFX because they were having the same problem and wanted me to fit a Riva/Rage/Radeon. Evidently we played different games and different programmers favored or understood different APIs better than others. I wouldn't agree that it ran well on Pentium 1 machines as mine proved useless and nobody did that back then for this very reason, but whatever, different usage case I suppose. Unfortunately though, all I can say on that one is in my tests it has never worked well if at all, so if someone asked me that would be the only answer I could give - unfortunately, this seems to bother some people.
Eww... The FX series. I remember when those came out, there was a mad rush to get hold of GeForce 4 Ti boards and people who had been on nVidia since the Riva started buying ATI cards all of a sudden. Which was fair play, the Radeon cards at the time were great. Prior to that I had a Radeon 7500 and I still miss that card very much. I've moved back and forth between ATI and nVidia a lot over the years based on which GPU proved best for what I was trying to do as i have no attachment to any company. At present, I like nVidia's stuff because ATI have some problems in certain GL applications. They make great cards with crap driver support which is a shame, it's like ATI don't communicate internally and the driver team don't know what they're writing for. But I guarantee if ATI made a better driver tomorrow and produced the best card I'd jump ship in a second and then bash on nVidia's line-up instead.
At the end of the day, another point to consider, is that competition is always good for progress. One only has to look at what happened when AMD released the Athlon to prove that. Or else use the SNES / Mega Drive war I mentioned earlier, do you think for one second Sonic 3 would have been so good if Super Mario All-Stars wasn't there? Would Yoshi's Island have even existed if Sega didn't have so many great games on their platform? Where the hell do you think Star Fox and Virtua Racing came from? Whether you like one console or another you have to at least respect that the other was somewhat responsible for it being so great, no company dared make a crappy product because it could cost them the market, they constantly had to compete on every level and it was great for the consumer at the end of the chain, especially towards the end when the technology was being hammered to the absolute limit.
^ For the record, I'm a SNES guy but I like both systems. I still jest with my friend (A Mega Drive guy) about it all "Dude! Donkey Kong is awesome! Sonic and Knuckles sucks balls!" but it's all in good fun.