I don't get the negative comments. The results look alright, but they lack detail at this point. This will improve over time and there are probably a lot of applications that don't need this level of detail anyway. I'd guess this will put some 3D modelers out of a jobb x years into the future, classic disruptive tech stuff!
I like to take a line from Two Minute Papers[1] - If this is what one "paper" was able to produce, imagine the improvements will be two "papers" down the line.
Same. These results are far better than I (with little 3D modeling experience) could generate.
A pro could do better, but a) do you have a pro available? and b) can they afford the time to model all of the item you want to throw into your mockup?