I recently picked up a bit more terrain for my WW2 collection it may be designed with WW1 in mind but a crater is a crater and I'd imagine European architecture didn't change much from 1914 - 1945 so the ruined building fits in really well.
So what does your $29 USD get you? Two craters and a ruined house and two baggies with flock and grass (I never use these I have about 50 or so little baggies around the house) and all pre-painted and it's done pretty nicely. The ruined building fits in well with the building that came with the old Jagdpanther box.
Overall it's cheap and ready to go straight away and as WW1 is played on a smaller table this is a good value product for WW2 I'd suggest picking up 3 or 4 of them if only for the ruined buildings.