I had a CSC centre section and back box on mine. Looked good, sounded mean (but not too loud) and seemed to be made of quite heavy gauge metal judging by the weight compared to the standard system.
But, and it's a big BUT, the centre section failed after about 2 years due to what appeared to be a design fault.
The over-axle pipe snapped clean off right next to where it is welded into the centre box. Examining the break, it was quite ragged and the metal at the break was sound and 'bright' - no evidence of rot, just metal fatigue.
Comparing this centre section to the standard pipe, I could see the apparent cause. Whereas the hanger bracket on the standard part is attached both to the box and wraps around and along the pipe for a short distance, so forming a brace across the pipe to box weld, on the CSC one the hanger is only attached to the box. This would appear to suggest that the share of the weight of the rear box which should be being carried by this centre hanger is in fact causing the over-axle pipe to flex ever so slightly, leading in time to the failure.
I chucked away the CSC centre section and replaced it with a standard one from EB Spares. Mated to the CSC back-box, (which was still on the car when I sold it another 2 years on), it still sounded quite 'fruity'.
Maybe I was just unlucky, but it might be something worth considering with regards to the design of any system that you might be looking at, especially if it's a more expensive after-market one!