Haha yeah. I did 6/7 CDP tests in a row before trying out BC, Achiever, Topscore, and now Qvault, today. Once I got the hang of CDP I was getting 24/25s and a 26, but different testing softwares seem to do some things that others don't and almost appear to be a different dialect of PAT at times.
BTW- If anyone is in the process of doing Topscore and is reading this post, there is a blatant error (at least in my case) for the first two angle problems of test 1. I am pretty sure this has been mentioned on SDN before, though, in some way shape or form