That's fine and dandy but it's a single skin tent and will suffer from condensation problems. I have yet to read a positive review about it. I have only ever seen one 'in the wild' and I was not particularly impressed with the lack of room.
And the fact that it takes a bike wheel to set it up, so then your bike is not available for getting around on. My Wenzel, I think, is bigger, but stuffs down into the same size sack. But the design is interesting, and I think if you made one based on a trailer frame, it could prove useful. I agree with you, Vernon, in its' current configuration, the Topeak seems about as useful as teats on a boar. But I think it represents an interesting turn on the design like the OP's tent.
It's been around for seven years or so and has yet to make an impact on the cycle camping scene