I picked these up at a game swap/auction for next to nothing. I figured you can never have too much scatter terrain. Craters are also nice because they can be used to represent exploded vehicles. I'm thinking that these will be pretty easy to get painted up pretty quickly. Terrain is nice because it's normally just a series of dry brush layers. These craters might be a little tougher because they have a fair amount of details. Ruined tank treads, ammo crates, etc.
They're actually pretty nice. Each half slots together with another half to make a full crater. Alternately, you can use them in a row as a type of cover granting wall.