We built a deckfort in our basement for our children to play on year-around, so the slide is inside.  Its been in use for about two weeks now and my boys (6 and 2 years old) LOVE it!  We actually had some friends with teenagers over last night and they had a blast on it too.  
It states that it is rated for 250 lbs.  I dont know that I would quite trust somebody of that weight on it.  Its totally sufficient for children, but not a large adult.  
Also, just forewarning, it is FAST.  We have it at a 4 high deck.  It is super speedy fast, which older kids love.  My 2 year old goes down on his belly to help slow him down a bit.