Obviously, since the range had models released over nearly forty years, the quality was very variable with the older models being crude and of interest only to collectors (the M-47, M-48 and Centurion and most of the WW2 models spring to mind here).
Even though all the models are rather simple quite a few of them are worth seeking out because they have the advantages of injection-moulded plastic: clearly defined detail and straight sharp edges with are sometimes missing from their white metal counterparts. In addition, a lot of these models were never produced by anyone else in this scale.
As you would expect, the range strongly focused on vehicles used by the Bunderswehr vehicles but other NATO forces and Warsaw Pact vehicles also featured which gives you a nice selection of Cold War armour. Below are some of the models I've been able to pick up dirt cheap in a local model shop of the dusty cavern variety and eBay. You can find a full list of Roskopf models over on the 87th Scale website. One word of warning: unlike the military range, Roskopf's later civilian range of trucks was produced in 1/87 scale.