Helicopters

Hi guys, i wanted to know if you use helicopters and in substance if they are good.

I've been told that DS choppers are great for mowing down inf/mili stacks. Great for expansion in inf heavy lands (w europe, e asia & e usa).
Never bought one before, so thats just what I hear

I only use them DS. In DS they are your main unit. My secondary unit is the marine, and tertiary is the militia.
For extra long range attacks combo the chopper and marine for a max range of 18 without any marine upgrades.
They are very effective in DS against inf and militia.