I have the Cobb RMM. It was ridiculously harsh at first to the point where I was considering putting the OEM mount back in (yeah, that bad). People would ask me if it was solid. After a couple hundred miles it has settled down quite a bit and it is helping me put an undeniably noticeable amount of power down to the wheels. It really feels like a 7-10hp increase. I'm now very happy with my purchase.
2012 SE Ingot Silver 5Dr | Injen Intake | Cobb RMM | H&R Coilovers | Magnaflow Exhaust | Snorkel Delete | Tint: 22% Front, 13% Rear | Debadged | Plastidipped 3D Carbon Wing