I just installed my SSD (Sata3, super fast) the other day.
YES: everything is "crispier"
NO: "best upgrade in 30 years evar" as many here state.
REALLY: Nothing worth to tell. Everything is as ordinary, as before. Maybe because my kit is already fuckin'4400 Mhz fast. But for sure the Samsung 830 looks like a piece of jewelry : )
Just to let you know.