I never ran a FatCat (way too loud) so I can't offer a comparison, but I do have a SuperMeg on the Cherry SEEG and I'm totally satisfied with it. Since I'm rarely totally satisfied with anything per my wife, that is a pretty glowing report. The fit and finish are top notch, installation was straightforward, and the sound level as you know is easily adjusted by adding or subtracting disks. I resisted going with a 2 into 1 for a long long time due to the unbalanced look on a bagger, but now I kick myself for not doing it sooner. As Rooster noted, there is no issue with clearance for my right leg to the pipe, either riding or with my foot on the ground.
Jerry