A friend used one on a 14' Zodiac and liked it (remember, though, he PAID for it). I bought one from Cabela's for my 16' Zodiac, but the fit was so poor I returned it without ever trying it. I have never seen any other inflatables (30 or 40 ) running one, so I question their worth. Does that help, or just confuse you?
Life is a grizzly experience.