Airyu has stated things very well. I'd just like to report on my own experience with Professor Sotis and Amok!.
I've trained in knife and sword work, including various FMA styles, off and on for many years. Like everyone else, I am always searching to improve my skills, and for new training partners. In early January of this year, I happened upon Prof. Tom Sotis' International BLade Fighters Guild Website. Impressed by Prof. Tom's CV, I contacted him. He was quite friendly and very open to training together, so I arranged to observe a regular Friday night class. I was extremely pleased by what I saw.
All of Prof. Tom's students moved and fought like true knifefighters, rather than just as EHs fighters with knives in their hands. The principles that he taught that night were excellent, as was his understanding of bladefighting as a whole. I therefore arranged to meet with him the following Tuesday afternoon to train privately. I've been training with him every Tuesday ever since, and to tell you that I am in Hog Heaven is an understatement.
I freely admit that Prof. Tom has taken my bladefighting to a new level. He quickly assessed and accepted my skill level and immediately took it from there, while at the same time filling in what gaps there were in my training.
The Amok! system contains the most well thought-out and organized progressions of blade skills, principles, tactics, and strategy that I have ever encountered. I believe that my earlier training partners, like Guru Jason Silverman and his great students, would freely admit that I was no fun at all to spar against, but under Po's (Prof. Tom's) tutelage my footwork, my offensive and defensive skills, my trapping, my disarms, my Dumag and other EHs Vs blade skills, my enganyos, my tactics, and my strategies are easily an order of magnitude better than they've ever been. Plus, Po has been incredibly generous in sharing his personal knowledge with me, not only from Amok!, but from Pekiti and Silat as well. And, best of all, there's still Degaso and Qol to explore
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Finally, all of Po's students and instructors have been equally open, welcoming me to the Amok! family like a long lost brother. I have more excellent training partners than I can shake a stick at now.
The bottom line is that becoming part of the Amok! family has been as useful and positive an experience as any I've had in 35yrs of MA training.
Good luck on your path,
Mario