System Comparison with KO
The ease of use of the KO system makes it more practical to play long enough to make money without blowing a mental fuse or turning red-faced because the dealer is going too fast. I would venture that most people on these boards would recommend high-low or other balanced count systems, as the KO players are too busy playing and making money to enter into such technical discussions. I am taking a break myself before I hit and run some more casinos in my new area.
As a level 1 system (card values of 1, -1, and 0), the KO system claims that it is the easiest to apply in real-world situations. It takes advantage of the imbalance in the # 7 (6 small cards vs. 5 big ones) to keep track of the number of cards played and generate betting decisions. According to Page 53 of Knock-Out Blackjack by Vancura and Fuchs, the removal of the 7 from a single deck adds +0.30% expectation in favor of the player while removal of a 2 adds +0.40%. The unbalanced approach accounts for removal of 7's, a card detrimental to the player (just ask Ihate17), while the balanced approach does not count 7's.
If you believe in the accuracy of the Simulation Results on pages 157 through 159 of KO Blackjack, the KO system has a slightly higher expectation (more income) than high-low and keeps up with the level 2 systems within .05 out of 1%. So, in summary, with the KO system, you can have better results than high-low and you give up 95% of the headache of a level 2 system for only 5% of the income expectation. If you memorize the KO "full" matrix and the marginal play strategies (KO Complete), your expectation would be even higher for the same "simple" counting effort. Since the KO system is one of the easiest to accurately implement, it has an overall advantage over the other systems.