My rebate was on a Gamecube it was £80 in Argos and N were rebating £30, I posted it expecting to wait months and it came by return of post next day! (slightly over 24hrs turnaround) I swear they must have posted it before they received mine.
anyway its the only rebate I have ever had
I also hate the ''buy it now get all your money back in 5 years" offers, as you never remember to ask for the money back