It's a good experience. The fights are pretty intense and there are a few knockouts as well. Don't bet big money on the fights though-they could be fixed based on the amounts of bet. Would suggest betting only small amounts if you just want to experience betting and feel the intensity.
This place is located in Patong. I would recommend visitors to book the tickets online such as Klook. The event is only held on every Wednesday, Friday and Saturday. As it is one of the famous attraction, it can be really difficult to get the ticket at the door. Book it online or with the local tour agency, they provide free transport to the Boxing Stadium. I was really lucky I must say. I purchased a Stadium ticket but the IC there offer me VIP seating. I was then offered to sit right next to the commentators. Initially I thought they are going to pass me a big bill for the seating but don't worry they did not. It was a three hours long event starting at 9pm (Thailand time). It's pretty unique and knowing muay thai is one of the famous Thailand culture , I will highly recommend this place. Cost: $50 for stadium ticket. Visited November 2016