Hi Jan,
I've built some of their products, but when I bought them, it was under the Rémi Brand. I've build the mill, the russian church and the house corner.
For the price they are good. But they are less detailled than a miliart building for example (no windows, doors, accessories etc.), and if you had accessories, they were vacuform, which is not the best for that purpose.
You will have to face the traditional challenges of vacuform (fitting, air bubble, not straigh cutting etc..).
If I may give you an advise : put some plaster or hole filler on the facade, it will give a more realistic look, similar to roughcast. If you don't, you mave difficulties to get your paint adhere to the plastic.
Best,
Julien