You get what you pay for. There are several different incubators but the three most popular seem to be the Little Giant, The Hovabotor, and the
Brinsea.
The Little Giants are pretty inexpensive and a lot of chicks get hatched with them. But you also hear a lot of complaints.
The Hovabator is noticably more expensive. They work pretty well but to me the biggest drawbacks are that the styrofoam is harder to clean if you get it dirty and it does take a bit more work to add water and such. It's the one I have. It works OK but I only hatch a couple of times a year. I could not justify the added expense of the
Brinsea with my few hatches. That plastic tray that goes in the bottom does really help keep the mess down during hatch, but the potential for a difficult cleaning is there if I ever have an egg explode.
The
Brinsea, which includes the Eco, is the most expensive of the three. It is easier to clean and the water is easier to manage. It has more electronic gadgets to make it easier to use so I'm not convinced it will last all that much longer than the Hovabator, but it is easier to use. If I were hatching just a couple more times a year, I'd probably get this one.
I don't know what you mean about he humidity thang. That could have a few different meanings.
I think it is a good choice. With any of them, I do recommend a turner. That alone makes it so much easier. Good luck!