I went for the first time a couple weeks ago, had a lot of fun! They have two lazy rivers, one like a normal lazy river, and the other with a twist. Water falls from the sky in certain parts; rivers rage; and to end it off, the giant waves never fail to entertain! I have also never felt more claustrophobic then when I rode Erie Falls. It is an enclosed tube slide made of thick black plastic. The water is heated and steaming, so you have no idea where you are or what direction you are headed. At two points during the ride water drops on you unexpectedly. It was fun. but I'll take the other awesome tube slides over it any day.
I'll give my full CoasterMania trip report soon.