Been a few times, always when its packed

Rita is pretty good. It tells you to look at the lights and before you have chance your gone at about 90mph.
Oblivion is crap IMO, you queue for 2 hours and the ride is over in 30 seconds.
Last time I went Rita had to be closed so everybody in the queue got a pass so they could jump a queue on a ride of their choice. The staff never took these vouchers off us and we got onto more rides in 1 hour than we did all day.