I've been on CC for about 2 months now, and I've had no problems with it. The basic, free membership is useful, the premium is more useful but not necessary. I've tried 5 other writing sites - including Scribophile, Wattpad, and ABCTales - and this is the most satisfactory so far. People give helpful and constructive critiques, and it's not too hard to earn enough credits to post more stories on. The critique system is fair. CC has given me a great opportunity to share my writing, receive useful feedback, and enjoy hundreds of other stories. It's exciting to watch novels grow and shift, especially when you, as a critter, have helped shape it. Everyone is very helpful and friendly.
The forum is interesting - members joke with each other, debate points, share their writing progress. It can get a little heated at times, but you don't have to participate if you don't want to, and members always debate ideas. In my 2 months of experience of actively engaging in the forum, an argument has never turned personal.
I recommend this site 100%!
(See my attached forum responses for a thread I started about writing a novel in the form of multiple short stories... if the photo-attachment worked.)