I am using the [COLOR=545454]
JN12 Incubator[/COLOR], which is a Chinese incubator, which proudly declares its 'Voltoge' on the front. The spelling is terrible, but I'm a tech-head iRL, so pretty used to awful variants on spelling. It is supposed to be able to take twelve eggs, but mine could only take ten - admittedly, several of my eggs were gigantic, but even interspersing them with the silkies, I couldn't manage. I built a cardboard 'loop' which I glued to the edge of the turner, increasing the amount of space available. This did work.
The eggs roll completely - 180degrees forward and back. You won't see it unless you've marked them - it rolls them verrrry, verrrry slowly a few times each day.
I suspect the temperature runs a little low - I'll know more when I know when hatching starts, but it seemed to sustain the humidity quite well - which is really, really unusual in my house. My house itself runs at such low humidity now that I get dry skin, so the incubator was doing well.
One problem - I think I had an old user manual! The new one is:
http://www.chonka.net/index.php/product/JN12.html
Mine said '37.7' temp for eggs - the new one says 38. I'm hoping that the slightly lower temp will just mean a longer hatch, not a ruined one.