I have Pyrotect in one of my cars, Simpson in another, and RCI's in another.
Personally I like all of them, but the quality of Simpson and RCI is far greater then Pyrotect. Like others said, mounting points are cruical to not ending up with a compressed spine. Mount back, not down.
you don't need an anti-submarine belt unless you have an open wheels car where you basically lay inside the cockpit.
I disagree with this statement. You can submarine in any seat, in any car if put in the right situation. It's to late to say..."damn, i should of had a 5pt" after your belts break your sternum....trust me, it happened to me.
Now on to street duty. If you buy any set of true race harnesses, they are not going to be street legal. I believe the law says something about the belts having to be released by ONE button. The new Sparco "H" 4pts are practically OEM 2" belts with a normal gay ass realease button in the center. It gives the look of a race harness, but I wouldnt trust those one bit. Get yourself a set of NEW 3" 5pt. Simpson harnesses, mount them by their instruction and you cant go wrong. If you want to save some money buy the latch style, if not, buy cam-locks.
If you have any more questions I'd glady answer them. I've had a lots of harness sets in just about every street car I've ever owned. And yes, I've been pulled for wearing them on backroads, but never got a ticket that held up in court.
edit: I just wanted to add that I would ONLY suggest buying a 3" 5pt belt set. Anything less with be too narrow and hurts a LOT if they need to protect you.