Guys: Blow Job Question

Ok, so guys: question, do you tell every girl that gives you a blow job that it's the best you've ever had or one of the best?

If so, why? Is it what you feel at the moment or are you just trying to make the girl feel good?

It seems to me to be an extremely common comment to me and I'm curious how many of you guys are lying to me or if I'm really that good....

Comments??