I have Corsa extreme on my truck and was recently able to ride in a Roush raptor. They are very different, the Corsa is more baritone when cruising. It makes a wonderfully cataclysmic jackhammer noise when you really romp on it, on ramps with concrete barriers are really fun, especially if you are towing. Its completely transparent except at initial start and acceleration, very civil, very luxurious, very Jekyll & Hyde.
The Roush is a deeper rumble inside, you always know its there, it drones in the 1800-2000 rpm range which can be fixed with one of several resonator designs. It reminded me of a glasspack type exhaust. It is more visceral, I think I would prefer it for an occasional use vehicle, it is angry all the time.
After riding in the Roush truck I prefer the Corsa for the way I use my truck, I can't here it at all over the Duratrac's on the highway, but its there any time I want it. When I am blasting around off road it is a constant crescendo, then when I return to pavement and head home it goes back to super cruiser mode.
I am a bit bias, I run Corsa extremes on my mustang too, but I have had at least 20 different muffler systems on it, this is the first one to stay for more than a year. If I buy another vehicle that will take a Corsa exhaust it will get one as well.