i went up there for a day this summer. i had a good time, it was really cool getting to ride in the summer, but it was extremely hot because you cannot leave any skin exposed or you will get some serious carpet burn. they also spray water on the stuff the whole time so you leave soaking wet.
i had a good time and would definitely tell people to check it out if you cant wait for snow, but for me once was enough. i fell off the large jump and slid down on my stomach and cut up my face, neck and stomach... which sucked. not to mention i saw someone over rotate a 180 on the jump and was in a line to go straight off the carpet and into the gravel they used to build the hill. luckily for him he stopped before that but im sure some people have rode off the carpet and into the gravel
it is an experience in itself meeting some of the people that go to liberty