.
I think that if the Forge Catch Can system isn't worthwhile on a very very highly tuned/modded 2.0T FSI, then none of the other catch can systems will perform any better either. If you read my review you'll see that the Forge system components are very highly spec'd indeed.
I should add that having a catch can means that you will have to regularly check its contents level (easy via the Forge window) and empty it accordingly (also very easy). So if you can't be arsed to do that, it's not for you.