The seat Geomerty is vastly different on newer Intamin rides (MF and later), resulting in a much safer mode of restraint. I believe Hydro had the exact same system as PP (I've ridden both, but all I remember is many many gallons(or litres) of water soaking me worse than if I had jumped into a pool. Intamin says on PP if the girl was holding onto the grab bar she would not have flown out(good quote for a laugh), also Intamin says the 5 point harnesses are un-necessary and even dangerous on a ride such as PP.
Favorite Wood Coasters: The Voyage, Ravine Flyer II, Thunderhead, Balder
Favorite Steel: Voltron Nevera, Steel Vengeance, Expedition GeForce, Olympia Looping
Parks visited: 232, Coasters Ridden: Steel: 894, Wood: 179, Total: 1073