Less desirbaly because of their chopper like setup. The 900 and 1000 customs were shaft drive with 10 speed gearboxes, which I think it really cool. As compared to the K and F model they are more difficult yo setup as cafe racers (although someone on this forum posted pictures of his converted custom recently). Of all the DOHC cb750s the F models are the best to cafe because 1) they were already factory style cafe machines in that the bodywork mimicked the cafe setups of the late 70's (ie the tracy styel one piece bodies) and 2) the F has a thicker frame and disc brakes at both wheels.