So I've been trying SA & SB for several months now. Have had some good (and some not so good) experiences so far. I'd say it's worth it if you can find those rare gems but it takes a ton of work and can be very hit or miss and downright frustrating at times.
Case in point, this week I had a meeting set up with a late 20's South American girl. We had met for drinks before and she is absolutely beautiful. A little pricey for my taste but for 2 hours she's a total steal compared to pros. Booked the Dayuse hotel and checked in. 45 mins before the appointment she texts me and says she can't make it because of something or other. She apologizes profusely. No idea if I was being played or not. Probably was.
Anyhow, in an attempt to salvage my evening, I hopped over to MG and had a great time with Yuri - for substantially less than I would have otherwise spent with the SA girl. Different experience, yes, but makes me question the whole time/value proposition of this sugar thing. Just my $.02