I did not watch any events in the past, but after Mighty Mouse went over there, i decided to check it out. Got to say, i was kind of impressed overall. It has it's own "flavor" to it, in comparison to lets say UFC or Bellator. IN the case of Ballator, basically you have a low end UFC copy, with a focus on name value rather than real ability, with ONE, there are some major differences.
First of all, the production values are pretty good, i would say, on par or close to those of the UFC. Michael Schavello is the commentator (he is one of my all time favorites). They have the ring instead of the cage, which reminds us of Pride, personally i prefer the cage for MMA, but ONE has Muay Thai and Kick boxing bouts as well, something which is also different. The level of competition is pretty good, their PPV level events are not that far off from the UFC and you get to see a few well known names as well. One thing that is also unique is that they use MMA gloves for the Muay Thai and Kick boxing fights, that increases the speed of the bouts and it is something i have never seen before. They have some different rules, i am not sure of all of them, but they have knees to the head of a grounded opponent (one fight ended via a knee while on the ground). Another thing that is kind of obvious is they most likely do not have anti-doping. Akiyama did not fight for 4 years and man.................he was RIPPED as hell! In fact most fighters looked like they were on some serious jungle juice.
Anyway, i guess it is not quite UFC, but it is different and entertaining. I would say they are already clearly the #2 org in the world at the moment.