Rush is, one of my favourite rides, and with a slightly loose restraint, as others have said the airtime is incredible. However I agree with John, that the ride experience would improve even further if the ride length was better!
And Dan, 200 pph on Mumbo Jumbo! I've never been to Flamingoland and never seen the ride but that sounds ridiculous, how/why is it so low? Surely it wouldn't have been installed if the throughput was known to have been that low.
But like you say, S&S rides do always seems to have incidents, often ones which could have been much worse, but there is still one S&S ride I really would like to try, it's called Powder Keg and is at Silver Dollar City in the States, have a look, in my opinion I think it looks a fantastic family coaster, and I think a coaster of that same type would work well at Chessington.
If you go down to the Towers today, you\'d better ride Th13teen.