All I have to base my opinion on is the hunter safety system pro series. The only complaint I had was with just the quick connect strap and the strap on the vest, it is not enough room to move much. You need to use the rope style treestrap so that you can adjust the length of the lanyard a little bit. I just purchased the rope style tree strap and it works wonders compared to the old set up. I don't have any issues now.
They all cost around 100bucks and are typically good for 5 years. Its a $20/yr insurance policy. After wearing one for the past couple years, you won't find me in a tree without them anymore.