Climbed with a guide from King Climbers last week for a couple of days. His name was Gom if you want to ask for him by name. He was experienced, safe and friendly, and King seems to have a good name. It suited me to hire him as a private guide rather than join a course. Most people on courses seemed to be thrill-seeking beginners.
There are several climbing companies at Railay/Tonsai. I saw nothing from guides that really concerned me but suspect they are more used to dealing with beginners than experienced climbers, hence why I was a bit selective and wanted someone with experience. King Climbers are now located in the Walking Street on Railay West.
I was also with my non-climbing partner and decided to carry no gear expect boots, harness and chalk bag. I also took a couple of screw gates and an ATC that I used when belaying, though climbing company would have provided a belay device.