We use them for "War of the Roses," but they can be used for any period system, as most follow identical basing rules. DBM, and DBA are popular simple systems. We are playing a 20 player PB email verison of Kingmaker, in which battles are resolved using a miniature system. You think that is hardcore - you should check out the AWI, Napoleonics (both infantry and 1/1200 scale sailing ships), as well as our WWII armor and 20th century naval stuff. I will try to get some photo's.
My very small 1/1200 Napoleonic ships collection paid for two years of books for our son's university education. I am hoping to keep my 1/285th microarmor and 15 mm armor intact through his educational process.