just got back from las vegas and i got to ride everything!
manhattan express: very very bumpy, no airtime, definatly not worth the 6 bucks to get on.
desperado: good drop, nice ride, lots of airtime, but it's bumpier than magnum so you cant go on it over and over again. its fun, but nothing special.
canyon blaster: very fun ride. no real thrills but its rather smooth and a lot fo fun. nice airtime and g's too. and the theming is cool.
speed: this was at the hotel i stayed at (sahara) the sahara is a dump... doesnt even have hot water for showers and the bathrooms are dumpy. but speed was awesome! smooth, airtimme, huge rush! however, it takes about 5 mins between train loads because of whatever reason so it has a very very low capacity... but it never has a line so it doesnt matter. also, althouth the ride is fantastic, the ride operators are questionable. one of them threw a bouncy ball into the lims.........[xx(]
overall, canyon blaster and speed were the best rides, but they are both in very bad hotels.