Very useful for painting.

I have tried a couple sets, while nicely done, they are difficult to line up and don't take into consideration the surface details on the vehicle.

Nice! Blu tack could fill the gap or complex edges.

would be good if we could get a picture of a model with these masks applied in order to form a good opinion

I wonder if I've missed something here. "I suppose you could cut these masks out yourself" Well, yeah... I tried to enlarge the "User Guide" which doesn't enlarge well. I still can't tell if you cut these out or do the different sections peel apart? If you have to cut them apart, how does that differ from what I usually do? I usually enlarge the kit diagram on a photo copy machine, and cut out the sections as needed. The old Paladin kit is a perfect example.

If the armor masks are like the planes ones, they are pre-cut.

I used their 3-tone camo mask for Humvee and I was pretty satisfied with it. The sheet is pre-cut into shapes that accurately portrayed camo shapes I found in field manuals. The Humvee does not feature many surface details so I had no problems in applying the masks to the vehicle. For hard edge camo, I would say J's work masks are very nice and well worth the money. Mario