I'm pretty sure they're real when I saw her and inspected them. When you have so much mass going on, it's pretty easy to tell when they're fake. I mean think about all that silicone/saline that has got to be swimming around in there if that were the case...pretty hard to miss. Another telltale sign are stretch marks. To go from a small cup to something like Monica's will definitely stretch the skin and she didn't have any noticeable marks from what I could tell.
In comparison to Kathy, I'd rank Kathy one of my all-time prettiest AMP girls I have had the pleasure of meeting. Monica is pretty in her own way. I also find JoJo's (PH/GFEAS/A&K/AL...not the current NYAW JoJo) face quite attractive in her own special way and many mongers while raving about her services remark on her "butterface". Attractiveness is all so subjective...one man's trash is another man's treasure as it goes.
I tend to focus on 4 things in my meetups. Is she passably attractive, is her service attentive, does she smile and seem to enjoy being in my company, and does she have a nice first-impression personality? Goes without saying that certain attributes can make up for others...like a great genuine smile can make an average looking person more attractive but generally speaking that is what I look for and Monica has all those qualities.
And let's not forget, YMMV is so true in this hobby. As long as I go in with this attitude I don't set myself up for huge disappointment when sessions aren't up to perceived expectations. I'm just there to enjoy my time as much as possible and hopefully she enjoys hers as well.