I've tried the Demo--like the WW1 demo it handles the P4 and P5 adults, and things like the P5 Combat pants and jacket are useful. In WW1 there were distortions of the mesh--things such as buttons stopped being round. The result was usable. Doing the same conversions with the WW2 demo, the meshes are essentially clean: round buttons and no sign of other distortions. The upgrade is very tempting.