Hi Sara,
I too am thinking of starting a CEX franchise. I have been to see the franchise director, he gave me the brochure and some figures for the shops. The figures seem really good, however I am going to check the other franchisees before I do anything.
They have approx 50 shops, I think 4 of them are franchised by only two franchisees (at that time, approx NOV 07 time) The franchise director seemed like a genuine guy, but again im going to do more due dilligince before i do anything.
Thats all the info I have at the moment.
Let me know if you get any further I would be very appreciative if you could share your experiance in dealing with them.