I have been to Charnchai two times; for 6 weeks and 6 months. It has a very friendly atmosphere, and a very physically intense training program even for the non-fighting/casual falangs. Mr Bee (the owner) personally helps even the beginners with their technique for standing, throwing kicks etc...
They have numerous active Thai's at the gym who train and hold pads, fight in local stadiums and festivals.
Nice place to run (lots of mountains and rivers around), good training and can organise fights ranging from local low-level fights to televised shows in Bangkok and in the big Bangkok stadiums.
They are extremely accommodating of women, both Thai and foreign, and the women I train alongside have noted that it is significantly better to other gyms they have trained at with regards to how seriously the trainers put effort into your technique and how well they treat you.
Hope this helps :)
