I had an old round hovabator, a newer (well newer than the round!) rectangular hovabator, both of which I used 20 years ago and then again recently. They aren't bad if you are paying attention. Hatch rate isn't spectacular, but they work. (Short of carrying them around in your shirt, this is incubating "the hard way".)
Then I bought the incukit, because I needed more space. I put it together, and had a hard time regulating the temp and humidity. I am a DIY'er normally, but when the eggs are expensive, like your chocolate Orps, it's frustrating to not be able to get it just right. It wasn't consistent enough for me.
Then I bought Farm Innovators rectangular Styrofoam forced air incubator and their turner. It has a thermometer on the top, but it isn't necessarily accurate. The random 106 degree spike that was listed above happened to me too. I had purchased (2) of them and one seems to be better regulated than the other, but still......
So I bought the
Brinsea Octagon 20 and the cradle(turner). I can't tell you how much easier it is to keep track of! The cooling cycle is something that the others don't do, the power failure and temperature alarms are nice to have, and when you have to open it for whatever reason, the inside temp is right back up to where it should be faster than any other that I have used.
I have left a thermometer inside in all 4 corners and in the center at different times, and the incubator is "dead on" what the thermometer on top says it is. The humidity is generally pretty easy to regulate with a vent on the face of the incubator. It's also much easier to clean than the Styrofoam ones. Hard molded plastic. The design is a better footprint, too. I currently have 2 on my kitchen counter and still have room to work.
I hunted high and low (
ebay,
amazon, Jeffers Livestock....) I ended up purchasing directly from
Brinsea as I had signed up for their email specials, and it went on sale in at the end of the month. By searching "
Brinsea coupon" I also was able to received free shipping.
I like my Octagon 20 so much that I bought another one. (needless to say, I couldn't afford to go to the movies for a while, never mind popcorn! but I am not sorry one bit!)