An experimental/homebuilt of similar but not exactly the same design, the Dyke Delta https://en.wikipedia.org/wiki/Dyke_Delta of which about 50 have been built, has its pilots reporting a comfortable ride.
It’s also much smaller. The main problem will be that the people sitting outside experience a lot of vertical motion when the aircraft rolls. That’s only a problem with the full scale design.
It was more fuel efficient only over a very narrow band of the entire flight envelope. Also, it suffered from snap-stalls and very poor stall recovery due to its delta wing.
This is, primarily, why you only see delta wings used in super-sonic aircraft where these limitations are more than made-up for its ability to go trans-sonic with (relative) thrust efficiency.