When they came out, I played them on the PC's of my father (period 1993-2000, in 2000 I got my own pc ).
Back in the day there was something called PC Private Project in the Netherlands, that was an incentive to buy PC's through the company you was working for, for free, with discount or handing in your days-off. First time we got a 3DFX-card, Quake went from pixely to smudgy... and it was amazing!
Now I use Compaq Portables and early laptops for the older games. I'm still looking for the best setup for later games like quake/unreal etc.