We haven't had any real issues with cogging though maybe we're not pushing them as hard as others. We found them to be reliable, certainly more so than some of the turbo systems running now, nobody has popped one in a tourer yet, and the speed is similar to an old 27t stock system on our track. From my point of view, it made sense anyway. We're not necessarily talking about adding another class, if 21.5 becomes the new 540, this class could be the 21.5 replacement.