This would present a really tough decision for me, the 620 or its other twin axle stable mate the 625 (I don't need a 6 berth but like the extra living space the dinette provides). They both have all the quality, style, and attention to detail that makes the Challenger range so exceptional.....classy fabrics, deep roll edged worktops, artistic LED lighting, ultra comfort deep sprung mattress on fixed bed, Fully lined shower, built in microwave, 5 240v points, and much more. However I just come down in favor of the 620 by virtue of its smart, spacious washroom.