The question, in my mind, is why wouldn't you take Systema?
-kicks
-knees
-punches
-elbows
-joint locks
-holds
-ground work
-grappling
-weapons
-throws
-health system
-multiple attackers
-works regardless of age, size, strength or gender
-deals with fight fatigue, fear and adrenaline control
-high learning curve
-doesn't rely on muscle memory
-consistency and continuity
-no stances
-no katas
-personally customized
Everything is there. All incorporated into one single system. No cross-training and having to adapt philosophies or switch between them in the middle of a fight.
There's always someone stronger. Or tougher. Or who has seen more **** than you have. Relying on these things is a good way to get seriously hurt. My jobs aren't as violent as some RMA members, but I've been in enough fights and chases and weapons situations to know what doesn't work. A knife doesn't care how much muscle you have. BJJ is useless against weapons or multiple attackers and adrenaline has failed me close to as many times as it's helped me.
In fact, it was after a situation at work where I'd ended up in a "2-part" fight with someone that I realized the limits of adrenaline. After winning "round 1 (and foolishly taking it easy on him - stupid 'minimum force') " there was a lull in the action (not even very long). The subject had given up, but subsequently refused to be handcuffed. I experienced a massive adrenaline dump and fear crept in. "Round 2" started and I got my *** handed to me though he agreed to stop fighting if he could walk back uncuffed. With much humility I agreed.
I don't run that fast, but sometimes I feel like a gazelle during a chase. Other times I feel like I have 45lb. plates strapped to my legs and I'm in quicksand. My point? Relying on adrenaline is unreliable at best and suicidal at worst. It affects different people differently and differently at different times and situations.
Systema offered not only a comprehensive H2H system, it offered me the philosophy I was after. When you look at history's greatest athletes, they often say the same thing as to why they're so dominant: because that have the ability "to slow the game down in their head" or "they're able to see the whole ice (or field, if you like)." I believe Systema does this. You're trained to deal with any situation from a physical standpoint, but you also learn how to keep control and make adrenaline work for you by staying calm and relaxed - which is when your reflexes are at their fastest anyways.
Trust me, it takes effort and a lot of anger to always be violent. When I first started work, I'd choke people while screaming at them at the top of my lungs. So much easier to control someone with ease and mininum effort than it is to beat them black-and-blue. You need a strong stomach for that. But the anger eventually goes away and then what?
Also, the art adapts itself to everyone's own physical abilities. Tall or short, squat or lanky, it becomes yours. No two people do it the same way.
So after about 300 hours of internet research, I decided Systema was the real thing.
Leave? I side with those who mention commercialism or watering-down the art.