I've had my CSG for a couple of weeks now. It's been raining, driven it quite a bit, spent 3 days in an airport open car park and I haven't had a chance to wash it. Still looks very smart. I don't think it will that bad to keep loooking good.
I find my CSG mk6 soooooo much easier to keep looking good than my previous mk4 and mk5 Golfs, both of which were Deep Black Pearlescent. In my experience, CSG doesn't show the dirt nearly as much as DBP.
I've never regretted getting CSG, and it would be one of the 2 colours I would have on my shortlist I if I was considering ordering a mk7 GTI or GTD (other choice would be Pure White).