No Playstation emulator is perfect, not relative to ZSNES and Gens emulating older machines. Every playstation emulator I've tried gave glitchy graphics and some sounds and music tending to be at the wrong pitch and speed (and my soundcards are probably the most advanced hardware on my PCs). Games are playable though - and can use higher resolutions than the original PSX games, but I still think playing on a real PSX is better. Dirt cheap now too, at least, second hand ones are.