These FAQs pertain to the ST-5C (PixCel 255) and ST-237 (PixCel 237):
What can I do about my CFW-5 not moving to the proper filter position?
What is the difference between the ST-237 and the ST-237A cameras?
Why does my software sometimes identify my old ST-237 as an ST-237A or vice versa?
Will the ST-5C or ST-237 be a good match for my new Schmidt-Cassegrain telescope?