Tt40 - I've also stsrted looking. My cousin has a springfree for her kids and it seems great. It is 4m by 2.5m oval and the tag said that it could hold up to 115kg. I had a go on it and it was great. The have had it three years and it still looks brand new. Also, no black rubbing on you yet. Would be interested to know what you chose because we are thinking a joint birthday present next February.