Guess I can only speak for certain on the models I've worked with as well.
The ones who have flat out said they enjoy/like/love being tickled:
Alexse, Amo Morbia (caveat only the feet), Meg (actual tickle fetish), Uma, Amara, Kili, Liyah, Kryptonite, Fenix, Lynn ("I'll never say stop tickling me"), Malibu & Amani.
At least 50% of the rest described it as "fun".
As to who enjoyed it the most - Gotta be a 4 way tie between Meg, Liyah, Amani and Lynn.
I've been in contact with Bounty of UKTickling fame, and she's also admitted she loves tickle work.