FWIW, which isn't much, TrueCredit FAKO's seem to run higher than the real things for those with FICO's in the mid-600's and below, and lower for those with FICO's in the upper 600's and above.
FAKO's are a spiffy way for their creators to make some quick cheap bucks. They sure don't do much of anything else. Two minor exceptions:
There is a score called the Vantage score, invented by all three CRA's. It has only one score for all three, it concentrates on the last 2 years, and they've been trying to flog it to lenders, without much success. All the Vantage pullers that I've read about (not many of them) are also still pulling FICO's, doubtless trying to compare which works better for them.
Prosper.com uses a variation of the Experian PLUS score. They're the only lender that I know of that does.
Many lenders will tell you that they don't do FICO scores, but that they pull directly from EX or whomever. This is conversational confusion --they are pulling your EX FICO score, which is in fact crunched at EX, which is why they say they're pulling it from Experian. (Same for the others.) They don't pull your scores from myFICO.com, because this site is for us poor schmucks trying to stay alive.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007