Greasepit is a small minded swindler. He uses his gas station to siphon gas from unsuspecting humans. He turns into a monster truck repainted from Mudslinger from the Off Road Patrol. His battlestation is a gas station.
The base unfolds into a rather large weapons tower.
Airwave is the second Decepticon battlestation, he seems to be the hardest of the four to get a hold of. The Micromaster is a repaint of Nightflight from the Air Strike Patrol. In the US line the Air Strike Patrol was the only Patrol that was repainted in full. His Battlestation is an airport.
It turns into a missile base, with two fairly big missiles.
All in all, a very nice set of four. If you have the chance to pick them up. I highly recommend giving them a try.