4 in a wing for me so far. The 'T' Is a good shape/size to use so I can fit around stuff. The cost is about what I'm usually willing to spend on a block like that anyway, even if they weren't in a wing, since it comes up to about 100pts usually. So I can diversify and have three to four 'elements' in my roster. That and since the leader can be killed and break the formation, I try not to over invest in it anyway. Maybe with cheaper ships I'd be more willing to try it, just to save some initial time with like TIE fighters or something.