I have the IncuView. I chose it because I didn't like the idea of Styrofoam. It's my first incubator. I've had 3 hatches and another in now. It's easy to see into and to clean. My chicks were hatching early, so I checked the temp. It was reading 99.5, but was running over 101. I've turned it down for this hatch, so we'll see. I don't like that it doesn't give a percentage on humidity. It gives a range for incubating and for hatching. But I haven't had a problem because of this.
As for the small number of eggs it holds, I'm going to buy a Little Giant to use as a hatcher.