just completed demo and if you like GTA then there is no doubt you'll love this, its identical in every aspect. Its GTA, lol, if GTA 4 wasn't planned for 360/Ps3 then i don't think you would have anything to worry about. The GTA series has been equaled but beaten? (probably not), we won't know until GTA 4 comes out next year and hearing that GTA4 is set in England for its next installment we won't have to suffer all this gangsta rap stuff hopefully anymore although it does suit the gamestyle that these type of games are offering.
So all in all i loved it and roll on release day