Not knowing the costs, I would CONSIDER one
if i had a boat your size - minimum. Yes, practice makes perfect but that also takes its toll on your boat, and, there's always the possibility you might never become an EXPERT in really tight situations. I prefer to have as much control as reasonably and economically possibly. Also would help when the entire marina is watching. Now, if you always hang off a mooring & have easy dockings, that's another story.