Chroma: I've had a few Thai massages years and years before TOS appeared. Then, they were a beating but felt great afterwards. Lots of walking on your back and bending you into various yoga-like positions.

The style is aggressive, but since your pain level is rarely low, it may be fine for you. With nTOS, there is NO WAY I would entertain the idea. I'd call them up and check out their level of English and try to describe your situation. If they can modify it or at least understand when you tell them to stop, you may be OK. In my experience, it's not a relaxing, but a physical exhausting massage.

Maybe it's what we all need to bang everything back where it belongs. Many Thais are in rolls of employment which require intricate, repetitive strain, poor posture positions and I've never read any papers out of the Far East describing rib resection or scalene removals. Report back if you go!