I don't know if it was the same brand as the one ST posted, but I helped a friend put up an identical hoise system for her sea kayak.

One big advantage to this system is that it is designed to raise and lower both ends at the same time, and is easy to use.  Wasn't hard to install with a low ceiling -  we mounted it on one longer plank that we bolted to the ceiling joists

My own do it yourself hoist is kind of a PITA to load a heavy canoe on - have to raise one end a bit, then tie it off and raise the other end a bit, etc.  I'm just using 1/4" nylon ropes, and when I raise one side or the other, it often tries to roll the canoe _( I have to have it bottom side up to fit over my truck ) so then I have to go and rearrange it.  It's for my white water canoe, and I don't uyse it often enough to change what I have,
but the store bought hoist sure works a lot easier.