Hi bros,
I've tried 6 Star before and their success % in terms of satisfaction is about 70. I started with their regular PRCs then moved on to tarmas after the OKT's recommendation. Here's my review(s):
Best Tarma: 4/5 score
Both girls were enthusiatic and competing to give better service. Girl 2 is awesome. She works hards, looks hot and is playful. She'll even play with herself while I pump the other girl. Girl 1 works hards because of Girl 2. she felt she had to perform as well... but I think she got excited as well because they BOTH got wetter and wetter. Good shit.
Girl 1 looks: 6.5, service 8 (wet)
Girl 2 looks: 8, service 8 (wet and willing)
Overall: Superb! worth every penny, still thinking about it! The reason why I still go to 6 star is in the hope of a repeat performance. I even RTF Girl 2 two more times! One more time tarma and once just her...then she left for good

total damage: RM380
Worst Tarma: 1/5 score
One girl was not pretty but willing, the other was hot but bochap. Too much KY, too many phone calls, calculative, clock watcher... This was really shitty... so crap that I went to service myself after i chase them out of my room.
Girl 1 looks: 4, Service 6 (ok-ok only)
Girl 2 looks: 7, service -1 (kanna sai atitude, can walk out half-way)
Overall: Horrible! waste of money, and trying toforget the experience, especially when the bladdy prc left the room while I was humping the other girl... can answer phone sommore!
Total damage: RM380
At the end of the day, it's up to you to find OKTs you can trust and rely on. Play the game long enough and you'll realise it's about consistency. My satisfaction rate in still 70%, which I think is ok for KL. I have two other OKTs in KL but 6 star is my regular, when I got money I call my jap specialist... but that's VERY seasonal... once in a blue moon...
cheers!