They're real, they're on these forums, too. They are a company that is quite polarizing, from the fact that they use a name that's not theirs and claim lineage to the real Motobecane, to making claims that are lofty, in terms of speaking about how "our frames are made in the same factories as such and such", but stopping short of making the false claim that their frames are identical to the major companies they list. They imply it, but also kind of prey on the fact that people who would shop with them take the frames at face value and think "If they look the same, they must be", when there's much more to in, and much of the tubing profiling is on the inside. That's perhaps why people make mention of their comparative heaviness for some models. The owner also gets into flame wars out here when called out about such things as the comparison prices he uses that are completely outrageous, to make the savings look huge. We're talking near Wallyworld level stuff advertised at 900, then prices slashed because it's from them.
Bottom line is that you have to do your shopping. Can you get a good bike there? Absolutely. Can you get a great deal elsewhere? Absolutely. You have to do your shopping, know what you want, and also understand that simply, most of the focus is on meeting price points, not performance points.
It has been noted by users and members of management that there are lots of the "registered today, first post asking if BD is real and how can they do what they do and their stuff looks great!" posts. There are threads where many are new posters speaking to one another about BD, so take it at what it's worth.
Additionally, the frames are an investment and not the breakable, wearable parts. You can beautify a frame, but at the heart, it's hard to replace the frame since they can cost a lot. If the deal is too good to be true and the references are the high level of parts, you can bet it's coming out of the frame, and usually, in places you can't see, like Al grade, tubing profiling on the inside that provides strength and removes weight, and so on. Also, recognize the names. Research. If you see parts with unknown names being put out there, but propped up for the lightness, for instance, don't let that bump up the perceived value in your mind. They are specced to reach a price and weight point in those top deals as well. You might end up paying on the back end, like when you need hub parts.
Shop smart.