Very recently done my rst for the first time with the megs kit, gotta say it really did get some crap off and the paint was like glass afterwards! Bit of a mission to do as you'll want to polish/wax it afterwards so it's not a 5 minute job but worth doing every so often i would say! I did the whole car and didn't use much of the detailing spray you get with....i can only think that the people saying it doesn't last long must be out there every week doin it lol, far too much time on their hands!