1) Atittude/Chemistry/Complicity
Sometimes right from the start you can feel this will be great. As she arrive she smile, show interest to you, you talk to her like a friend. Attitude i feel is the KEY factor in what can make either a GREAT memorable meeting or just a "good enjoyable meeting"
2) Sexual Drive/Sexual Chemistry
This obviously vary from escort to escort and it could also blend with the first point, as if the chemistry is there it will continue in bed.
3) Look
Obviously she has to attrack you a lot physically, i still think the first 2 points are more important, i would totally prefer an SP a bit less hot to my eyes if points 1 and 2 are there than the prettiest woman ever that does not have the first 2 points. But to get the "memorable meeting" we are talking here i feel those 3 points have to be there.
I won't mention kissing or BBBJ because to me they are bare minimum, i would not book an escort that does not offer those minimal services.
As for Extras well... im not sure if i should make them into a point or not, but ill admit that for me to have a truly memorable 5 star meeting, i kinda need a cim or a cof. I do book girls sometimes that does not offer either, sometimes because she is just sooo hot i have to see her, sometimes because we met in a party and her attitude was great... Sometimes i take a chance not knowing if ill get it or not, but when i take a trip down memory lane i can honestly say that my most memorable meetings had one of those 2 extras. But im fully aware that this is personal to me. I don't cum from FS, so if i can't cim/cof ill go with cob but its never as satisfying to me as the 2 previous.