I replaced a Tubus Tara for a Soma porteur rack on my commuter/tour bike. I feel its more versatile with the wide platform and the ability to attach panniers, a feature I haven't seen on any other porteur racks out there. Its made from chromoly tubing so its stronger than aluminum. Plus, it fits most forks, with or without braze on.
I plan the utilize the platform in addition to my panniers, on a tour this summer.