I used two types, both scaled for 1/48, for my last build Eduard 1/48 BF110F Profipack Build
Both worked pretty well and you can see the results on my blog. The TopNotch one was best for curved surfaces as its designed to stick to the surface (a bit like masking tape) but can be re-used, many many times - plus you get loads of mottling option masks just in the one pack alone. The Eduard (PE one) worked well on the flatter surfaces like the wing upper surfaces.
I’d reccommend both to be honest, although you still need to be patient and do a bit of the aircraft at a time, masking as necessary.
