Firstly don't just send it into any lab, as it uses an obsolete process that very few labs are now able to emulate and you'll likely ruin it if you have it put through the modern C-41/E-6 processes.
I've never used Process C-22 either, but they've certainly got some good results if you look at their gallery (
http://processc22.webs.com/gallery.html).
If you use them though, expect to wait a few months to get the film back as they have to custom mix the chemicals for obsolete processes like the one used for CT18, so they wait until they have enough waiting for development for it to be economical.
Another option is Film Rescue International in the USA who have a very good reputation. They may be quicker as they process each film type on a 6 week rota, and postage back is not too bad either. They'll supply small scans online from which you can then in additon select larger versions of any that you want for a small fee. They use a proprietary process where they first get a B&W image which is scanned, and if that is successful then a second process is used to regain the colour, that way you get a copy of the images either way.
http://www.filmrescue.com/old-still-film-developing/
