I've swam quite a few times at the Crystal Lake. I'm a novice swimmer that only started Lake swimming in June this year. If you haven't been yet, it really is superb, such a tranquil location. Quite magical.
The team Adam, Gemma and Jim are the guys I've chatted with so far and they're so encouraging. I thought at first that it wasn't going to be for me being a plodder but the Lake caters for all abilities. I've recommended it to lots of friends and honestly think everyone should try it! You won't be disappointed.