MBY’s Jack Haines says: “Williams has grown up from creator of exquisite RIB tenders to a producer of genuinely talented day boats, as the 520 shows. Not only is it a brilliant tool for fun days on the water with your family but when you’re on your own (or wishing to scare the pants off your mates) it is, pound-for-pound one of the fastest ways to move on the water.”