I have both an MB-1 and an RB-1. Both are lugged steel and have great construction quality and handling. I may eventually convert my MB-1 to SS. It has skinny (130mm?) rear dropouts so it's a hassle to use a normal mtb wheel. Really great feeling frame, though. Just wish it wasn't so small for me. The RB-1 is my only road bike, built up with all-Ultegra 9spd and 28mm armadillos on old wheels. It's not light, but it rides great and holds fatboy tires. I doubt there are many more versatile road frames out there. Would probly make a good fixie but it's vertical here and I already have a Miyata track bike taking up the parking space reserved for completely useless bikes.