Well we have just tried ours out and it is awesome!
Easy to set up and use, but do be careful as if you try to set it up when very windy it could have an aborted mission (fall from its launch pad).
You really do need someone to hold the rocket when you are pumping it up (just so that it doesn't fall over).
I must admit we were all surprised at how big it was when assembled, big.
Great fun for kids and adults and a novel plaything for any party.
Just watch out for being the one that has to hold onto the rocket for 'lift off' though as you could get a light splash, but that is half the fun.
It goes high and far, not to be used in confined spaces. One big think to remember though is that when you take it somewhere to use you do need water to use it.