I've got a Merckx SLX 55cm. I like it. Apparently the larger Merckx frames ride better too. The SLX tubing is meant to be stiffer (and a touch heavier) than the SL due to internal rifling of the tubes. Can't say I notice any real flex in the frame and I'm 6ft and 76kg.
There's also TSX tubing to consider which is apparently more suited to longer distance riding...
I've got a Merckx SLX 55cm. I like it. Apparently the larger Merckx frames ride better too. The SLX tubing is meant to be stiffer (and a touch heavier) than the SL due to internal rifling of the tubes. Can't say I notice any real flex in the frame and I'm 6ft and 76kg.
There's also TSX tubing to consider which is apparently more suited to longer distance riding...
http://www.equusbicycle.com/bike/columbus/columbuschart.htm