It seems that FICO scoring dings you for a CFL. However, it is one of the minor things that hurts, IMO. I say this because under "What's hurting your score" this never even showed up on mine until recently, and I've had CFL for sometime.
Normally, it is the high credit risk borrowers who get CFL. So, the score model stereotypes and says everyone who gets a CFL must be high risk so we are going to ding your score for having one. (kinda joking.....but almost true)
However, having the TL and the good payment history outweighs the bad, I"m sure.