Re: C2 Condenser mics
In short: not sure. Behringer have some interesting marketing and production techniques. It basically consists of them taking everybody else's ideas and producing the same product for cheaper. This means they don't really have to have an R&D department.
In principle, I can't see anything actually wrong with those microphones per se. Usually Behringer produces a very good product for the money (for the reason stipulated above) so they should be ok. I've never had any personal experience with these microphones, however. Sorry I couldn't be more helpful.