I use the ridge hooks alot. Very helpful with chimney sweeping. The wheels on the that particular hook swivel, so you have to be careful because the ladder can swivel sideways and roll down the roof as you are pushing the ladder up to set in in place..... it's kinda hard to explain what I mean... but it sucks. I replaced the swivel with a non swivel wheel and it works much better. You have to be careful with some roof vents because they can get crushed when using a ridge hook. All in all... a must have for any roof walkers.