[Suhiir]

I regularly use SEAD aircraft as I regularly play the USMC which relies HEAVILY on air support and helos. I usually find that a single SEAD aircraft is sufficient to deal with opposition radar guided AA then use helos to deal with the rest. Once the majority of their AA has been delt with air strikes are of some utility. But as Mobhack said, they're really only useful if you have swarms of them (6-8+), and that's not even remotely cost effective.

As Mobhack said, for the cost artillery is FAR more effective then aircraft. I tend to think of aircraft as a "flavor" element in WinSPMBT rather then a useful (for the cost) combat unit.