I have no experience with the Retrovelo, but many, many miles on an Azor Opa. I highly recommend the Azor. It's a rock-solid piece of equipment that requires no upkeep. The steel frame and fat tires make for a smooth ride. Getting up to speed can be a challenge if you're dealing with hills. I commuted on my Azor for a while and then moved to a Surly Long Haul Trucker.