just want to chime in since Flushing is mostly where i frequent, and once in brooklyn.
1. as most people said, the girls rotate. If you punted in those manhattan spas most likely you probably punted a girl that was in flushing before. I remember seeing a WG in flushing who had worked in the manhattan spa before.
2. If you connect with a WG it is almost worth it to trade wechat info. she is your golden ticket that you will follow the trail to new places. I remember following this girl i liked, one of the better punts i had in my life, and it took me out to brooklyn. i remember it had 6 girls working there. the most i ever seen. I never been back because the guy that runs it runs a very tight ship.
3. I tried a lot of places when I found out flushingincall. and again, as others have said, if it's too good to be true than most likely it is. most of these women are in their high 30's to low 40's probably? asians are very deceiving with age! they add some makeup and they can call themselves 22-27. I am asian myself and most people are surprised how old i am.
4. lastly - if the place is non-asian, then it's non-asian.