The "1 Hour Warm Up" mentioned in the following video is not an exaggeration, sometimes it goes quite a bit longer:
https://youtu.be/fJqkrONELZI
I found the conditioning to be a bit much, I was usually almost too tired to throw proper technique by the time padwork rolled around and after sparring I was basically useless so I never got to clinch.
The foreigners that train there tended to be very good & extremely well conditioned.
Not a single one lost a fight when I was there.
The Thais, not so much - 2 of the guys I trained with were straight up KOed.
There's a heavyset Thai guy that shows up on their webpage (the guy in red & black standing in the middle):
He's the only guy I would ever think about seeking out for padwork again.
Had very little interaction with Mr Pinyo.
Main guy that held for me was a guy named "Noi" (wearing the blue body pad in the video) and he thought he could just punch the fat out of my gut - averaged something like 300+ situps each workout with him, and probably a good 500+ shots to the gut too. He would hit me whenever (usually with the hardest part of the mitts) - in between situps, while hitting pads, while shadow boxing, while drinking water. Threw up a lot. Bruised up pretty good for a few weeks after. Had no skin left on my tailbone from the situps after the 1st or 2nd day.
They had me sparring this young kid (16 or 17) a lot, at least 8 rounds a session, mostly boxing. He had no lateral movement and wanted to cry about going too hard when he was throwing everything but the kitchen sink. The only stuff that caught him with any force were jabs he ran into while trying to bulldoze in for haymakers. I tried to take it easy on him, played a lot of defense. Didn't seem to help him for his fight though.
My take away from that gym - if you're already in awesome shape and/or you're going to be in Koh Samui a long time, then it would probably be worth it. Otherwise, I think there are better options. I did hear afterwards from some of the guys that the week I was there was not a good one, that Mr Pinyo had been slacking off, and after the poor performances that week had gotten more involved. So take my experiences with a grain of salt.