Google BMC reviews. I believe that they tend to be very nice frames, that are quite responsive and stiff. If you are at the level of riding experience that you have no idea of what BMC frames are like (as opposed to all the salivating techno geeks on this forum who spend most waking hours riding/reading bike mags & internet forums) it may be a bit more than you bargained for.
Your question makes little sense. BMC bikes can be pro-level equipment, so you are talking about the merits vis-a-vis something like a Colnago Extreme C, or Ridley Helium, or any number of other pro-level bikes. They are all top notch but have different 'niches', and what you choose depends on your riding ability, your experience, how much you ride, how much you weigh, whether you race or not, and a thousand and one other factors.
In any event, as Alienator said,, ask for a test ride and see if you like it. And a test ride is not once around the parking lot!