I have an early '80's Professional. Built with SL I believe. Mix of Super Record and Nuovo Record. The bottom bracket is just as stiff (and maybe a little heavy) as it can be. Not the lightest bike I own, but it just feels so solid, especially going downhill. I like the old style graphics, the Merckx logo pantographing on the seat stays and the "Eddy" and "Merckx" pantographing on the flat fork crowns. I ride this bike a lot (took it out for about 50 miles yesterday) - it fits me well and just inspires confidence when I'm on it.