Went last month as you get free admission if your seeing an act at the 02.
I really enjoyed it, covers every era in seperate rooms whilst in the middle there stuff like an interactive map that you can scroll along that shows you important locations, i had a scroll on Sussex and includes Fatboy Slim, The Levellers and The Kooks. Theres also this oyster style card that you place on things and can log into the website at a later date and see things back. Main thing for this was the different dance routines that you record in a booth and watch back later.
Alot of the stuff there did involve putting headphones on though which after a while did get abit samey.
Can easily spend over an hour in there without noticing the time, id say you would be disapointed with the deal working out at £6 each.