I use CC and CCLite.
As a reserve maggot it USED to be a useful tool for determining ones status WRT trips in open flying and FIFO. However CCS screwed all that up. Well, the companies complete lack of transparency and planning screwed that up.
I just received an email from Crew Companion which claims they've made significant inroads to open time trip trading and on other fronts within the program. Time will tell.
I like the program. It easily paid for itself with just a few successful aggressive pick ups. I anxiously await to see how Tom fixes the CCS problems.