I've tried it on a short basis in the past and it was good if your trying to use their web mining future (best among few others at that moment, not sure if it's still good) but upon using their downloaded software, I found it a lot slower and less hash rate compared to the popular ones but again has been a while and a lot could have improved ever since. Overall a pleasant experience. In case you want to read regarding their thread, you may try the following link:
https://bitcointalk.org/index.php?topic=528848.0
