I have a Model D, Poly D, and a couple other small pieces of commodity/utility gear from Behringer, and agree that the accessibility of their reissue work has really opened the world of synths to a lot of people that otherwise wouldn't get into it. However, in addition to the examples of Dave Smith and Oberheim noted above, the latest scenario with Mutable Instruments last year is why I've decided to avoid their modular gear going forward. I know Emilie made the designs open source and that has been a big boon for smaller companies making clones or variations on the designs (After Later, Cal Synth, etc), but it's an entirely different scenario when a large corporation lifts the design without giving credit (Mutable Plaits -> Behringer Brains). If they end up producing their clones of the Synthi or the Music Easel, I might consider it, but I'll be thinking about it way longer and harder than I did when I bought my Boog clones.
So yes, buy the modules that interest you, but I think there's a place for personal responsibility in whom we support with our dollars.