This is a great hot, summer activity!  My two boys love this thing!  I love that it has two inflatable surf riders so they don't have to fight over them or take turns.  I also love the bottom is raised so it slows my little one so he doesn't slide right into the grass.  Occasionally he bumps over that little edge but most of the time it stops him or slows him down enough and keeps from a giant mud puddle happening at the bottom.  My suggestion is to let it run for 5 minutes or so before sliding to let it get wet enough to work well.  My boys spend an hour or more on this thing whenever we pull it out.  Great choice in water fun!