Sadly, the plastic landwehr are not great. I bought one box to start this project and it nearly made me quit altoghether. I have replaced all but 8 of them with various metal miniatures.
Ironically, while their plastic is the worst, warlords metal miniatures are the best. Too bad they have so few variants. Perry miniatures are slightly smaller than foundry and warlord, but still look ok (some people are just shorter than others). Foundry has the simplest designs, but also the best casts of them. Several perry and warlord models have been quire poorly cast.