I'm curious about this frame as well. I was set to purchase the Carbonda FM909 until I saw this post. However, I'm still on the fence because I have a question/concern with the rear triangle. It appears that the seller provides two options for the link: 1) threaded link for a 200x50 Brain shock and 2) normal link for a 190x40 standard shock. However, there is only one option for the rear triangle itself. By comparison, Specialized offers two different links and two different rear triangles depending on which version of the Epic you buy. The Specialized Epic rear triangle has the threaded link, bolt holes on the non-drive side swingarm for the Brain hose, and a larger hole near the rear axle for the Brain itself to install on the rear triangle. The Specialized Epic EVO rear triangle has the regular link, and it eliminates both the bolt holes on the swingarm and the extra hole for the Brain near the rear axle.
I reached out to the seller about this, and they confirmed they only provide a single version of the rear triangle whether you want to use a Brain shock or not. It has the holes on the swingarm, which is not too big of a deal to me, I can just install some bolts to plug them up. I am concerned, however, with the hole for the Brain. Since I plan on using a regular rear shock, the seller said they will provide a rubber stopper to plug the hole in the back.
I have asked for photos of this and will post them if/when I get them.
Anyone have experience with a Brain shock that could comment on whether I should be concerned with this rubber stopper design?