I did. It's pretty sweet if you're one of those people who pines for the return of the space sim and loves Wing Commander, Freespace, etc. SSZ lies closer to the arcade end of the spectrum (there's no power management, for example) but otherwise it flies like most space sims. Then there's the Strike Mode stuff, which allows you to turn your ship into a mech with six degrees of freedom, such that it actually plays a bit more like Descent and gives you supercharged weapons. I'd place the game a tad on the difficult side, especially because some mission objectives have ridiculously tight timers (at least for me), so if that's a turn-off be warned.
Haven't tried Strike Suit Infinity, dunno if the allure of chasing high scores is enough to get me to buy it. But SSZ has plenty of that as well to unlock upgrades and the like so maybe it's worth getting as well--it sounds like the gameplay of SSZ is completely intact. If you have no interest in playing through a traditional campaign, Infinity is a bargain.
