I'm sure it's am authentic convoy, mtn electronics is a stand up business that supports our hobby at what I guess you'd call a grassroots level.
As for dedomed being a good option, it depends on why you want that light and what your intended purpose is. People buy or perform themselves an LED dedome to help make the light throw further and to increase the candela output.
If you're looking for a c8 light that's the best thrower you can buy, one with a dedomed LED emitter is the way to go. Obviously choosing a specific type of emitter is another level of choice, I.e. Going with an XP-G2 or an XML2, or even the new XPL-HI, a factory no dome version of the XPL.