Finding a used one will be tough. It has to fit not only the rough length and beam of your boat, but each and every stancion, shroud, push pit leg, etc. is an Opening on the cover.
I personally think they are worth it, and bought one my second year of boat ownership with my O’Day 322. The first year, I covered it with some tarps, and made a wooden frame…took way too long to do it. Tearing it down in the spring was a huge mess too.
The second year, I bought a 3-piece canvas cover. That was about 8 years ago. Cover is still going strong. Just pulled the boxes out of my basement and loaded them in my truck to take out to the marina…boat gets hauled on Saturday.
The 3 pieces zip together with some beefy zippers. Mine uses the boom for support in the back, and A halyard attached to an eye on the part to help keep it tight and suspended over the winter.
I would elect to get mine a little longer on the sides if I were to do it again…mine comes pretty much just to the toe rail in some places…having it a foot longer all around would have been niice.
I have had to use my speedy stitcher to reset a few things over the years, but overall, she looks pretty good for 8 years. I also had an issue with the ends of my traveller being very sharp, and the cover rubbing on them, especially in a strong wind from one direction or the other. I put something against the end of the traveller to keep the cover from rubbing on it until I could get a grinder and round off the edges of the traveller…all better now.
The tarp version:
Canvas cover:
Mine took 6 months to make, and that was before the pandemic and supply chain issues…
Greg