Yes, Zenking is correct. He has some good blackjack knowledge and can be a benefit to others when he stays away from the goofy stuff.
So a pure Wong would be something like entering at TC +3 and exiting at TC +1 (about break even).
The advantages: You won't be playing many rounds but every round will be played at an advantage. You could even flat bet or use a very small spread making it more difficult to peg you as a card counter.
The disadvantages: You won't get in many rounds and it can quickly become pretty obvious what you are doing, especially if you are standing around tables that are pretty empty, which you really need in order to be sure you can jump in at the right moment.
While I decided early on that "pure" wonging in, as described above wasn't for me for the reasons given, a wonging "out" technique of playing off the top but exiting fairly aggressively on a mild negative count has obviously not all, but some of the benefit. You are avoiding the worst (disadvantage) counts. You play more and it looks more natural. You are not standing around,
standing out and making other players feel uncomfortable. You do need to spread, but you can tone down your spread from what would be required for a play all situation.