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The basic model (The Octagon 20 Eco) is what I have - actually, I have two of them, and one auto-turner.
I went with the Eco because I'm in college and I just couldn't spend an entire semester's worth of textbooks on an incubator. But, really, I've found that the Eco is all I need. You'll need a good hygrometer to monitor the humidity, but it's really straight-forward. In most cases, you just fill one of the water-channels in the bottom of the 'bator for the first 18 days, and fill both water channels to bump up the humidity for the hatch. If you don't have the auto-turner (I didn't until two days ago), you just turn the whole incubator an odd number of times per day - I have chicken eggs being auto-turned in one of my Octagon 20 Eco's right now, and duck eggs that I'm manually turning in the other.
Even the Eco is a "set it and forget it" incubator - you just have to check the humidity every once in awhile. Once you have the temperature set (adjusting the temperature in the Eco is a pain, and requires two different screwdrivers), it never wavers. I set both of mine when I got them (one was set about two degrees too low when I first got it and plugged it in) and then you don't have to worry about them or mess with them - they hold rock-solid at the temperature they're adjusted to.
HOWEVER - the very first time I incubated in my Octagon 20 Eco, I had the humidity too high - actually, the humidity in my house was just right, but I had water in one of the channels, which was making it too humid and didn't realize it until the humidity had been WAY too high for pretty much all of the second week of incubation. In that instance, I know I could have saved at least one of the chicks if I'd had automatic humidity control during the second week (I did get two healthy chicks though!)