Blackjack Attack is weak for a number of reasons. First, the author has no concept about what realistic casino conditions are and, as such, bases a lot of his advice on pure assumptions. Assumptions that will cost you money. Secondly, he does not have a realistic, working knowledge about what kinds of play gets you heat and what kinds of play doesn't get you heat. Sure, any clown knows that a 1-30 spread is better than a 1-12 spread, and it's so nice that Schlesinger has taken up the role of Captain Obvious and given us a bevy of charts and tables to confirm just that. But when he says things like, "Don't bet up except after a win" or recommends the spread levels that he does, because of his assumptions about casino heat and what gets observed and what draws attention and what amount of backcounting is optimal or how long of a session you can play, he is costing the aspiring professional money. It's extremely simple, really.
You have to judge things for yourself, and you have to be smart about minimizing scrutiny while maximizing EV. Little tricks like finding a pit with a whale and playing at a table in the same pit but in a position that makes it inconvenient for the floor to watch you will get you far more EV than general, theoretical advice and statements dreamed up in a vacuum. If you're going to try to win real money from card counting, you have to do things like that. If your top bets are well into the blacks, your first job in a casino should be to scout the action in general and see what sort of ceiling you have in terms of bet size and then to find the tables that offer the best conditions and take it from there. If you're working with a team, you can find the casino that offers the best ceiling and conditions and converge on it. No need to wander all over town playing 30 minutes here, 30 minutes there, and so on when you can park it in the casino with the best conditions and get away with murder without even getting noticed.