I just had a 100% hatch with my incuview, with shipped marans eggs. Beginners luck? Whatever it is I'll take it! I had to trouble at all keeping the humidity up, but I do live on an island so the air here is pretty humid to start with :)
I'm on day 13 on my first go with my new incuview. I'll be sure to post the results. So far so good it seems, but it's hard to tell for sure as they are super dark eggs :)