I don't have any knowledge of how well they are built or even more importantly how well they cook. I do like the way at least some of them have a double removable round insert (similar to the Weber GBS) and their overall cast iron grate set up. They at least LOOK like they would be a good grill.
I would have to agree with Larry, though, that based on what I see up for sale, these have pretty limited following/market appeal. The may actually be a really good grill, but I wouldn't sink time and money into one unless just for personal use.