In reply to Murray Walker:
I've got a mate who uses one (like you - family/basic use, no fancy tricks!), and haven't come across any problems.
I've also seen them set up for group use with the ratchet round the back of the tree, rather than in free space - assuming you can (1) protect the tree adequately and (2) tighten it OK that seems to take out a lot of the risk of kids being whacked by the ratchet.