I would not have any qualms about buying an Augusta, based on what I saw in the you tube video, they look like they are looking at the middle to upper level market. There have been several brands come along with the same business model over the last ten or so years. Unfortunately very few of them seem to make it past the five year mark, that's not to say they are not a good product. One that comes to mind is the Earthbound, very innovative and it was well built. If I would have come across it a couple years later, I would have bought it.
If they are using the same construction methods in the Flex that they use in the Luxe it would be very high on my short list. If you look at the cabinets that the worker is spraying you will see that they are using the best in cabinet construction techniques. The joints are fastened with the Kreg pocket hole fastening system, they use european style hinges vs the surface style hinge used in many of the brands.