Hi, I have an Avon 620 which is used in the Solent and am very pleased with it. It has a Yamaha 150 TRP. It certainly handles the Solent chop without too much fuss. I currently have it on the market as upgrading to something bigger (see here http://www.boatsandoutboards.co.uk/view/F115406/)
I think some companies have used poor quality fittings for consoles and things, as Andy said, the Avon Adventurers come "bare boat" (the guy at the boatyard where I keep mine mentioned that he had seen self tapping screws for securing a jockey seat to the deck, and that they were often repairing these shoddy installations!!!). I have had no problems with the fittings on my boat.