I've been working on the Revell U-wing for the past 3 days, and it's really not too bad. With a nice paint job it will look pretty slick, but of course not 100% accurate. I'd say the shape/proportions are almost 100% accurate, but the surface detail and panels lines are around 80-85% accurate
I can't believe I'm saying this, but the panel lines on the Revell are much more accurate than the Bandai image above. Maybe the Bandai is just an early prototype and they'll get more accurate lines in the final project.