it's sounds like monkey has been playing a beatable SP21 game for awhile.
the problem i see is that i rarely find an SP21 game in my area that you could attack with counting. as time passes it *might* become more popular, but right now there is a lot of competition, superfun, double attack, etc... if you have games in your area go for it, otherwise why learn it?
i think there are two casinos that i play at that have ONE table. i can't remember if either use CSMs. so i never gave it a real thought, others have more options than me, i'm sure.
i wonder if barona valley ranch would let wong play SF21 or SP21? i don't think they let him play BJ
