Down sides, don't put your fingers in the way when you collapse them, they bit like a pit bull, don't let it fall over, a dent in any part of the tube and it won't collapse or if you get it collapsed you can get it to come apart again, don't splash anything on the tube bit, same problem as above.
Apart from all that, I think they are great thing, Brian bought his second hand on evil bay for under $100 from memory, complete with a carry bag, he's happy with it, Kevin's fell over in the wind and now doesn't go up or down and because one of the sections won't fully extend the locking bits don't work..... I won't post here what he said about them.... but it wasn't on the plus side
