We have one, Matty was bought one for his first birthday by his very over-excitable-loves-the-bright-plastic-toys- big sister, and his other big brother and sis
He played with it for a while and then pretty much abandoned it. It is very large at the base, as others have said - which was a bit of a pain in our old house, we put it away and forgot about it until S was just cruising and M made me get it out for her again, she does like it but like others, it was a while before she could get on it herself and she still struggles with it a bit.
It does make you pretty popular with other children though!! Everyone else couldn't wait to have a bounce!! Children do tend to fly off it if they bounce and spin too fast

The music's rather grating too, it sounds like shopping mall music, but even more annoying
Personally I wouldn't have spent the money on it, I really did think it was rather one-dimensional as toys go, even a bigger selection of music so they don't tire of that would have been an improvement.
C x