I'm just new at this but saw you didn't have replies so I'll give you my 2 cents. I bought a Farm Innovators incubator from CAL Ranch this spring. Its almost identical to Little Giant (which my bro in law has two and has fits with them). Have not been able to hatch ANY eggs in it. Thrown away 50. I think I get the temps figured out and steady, and then they spike - up to 104 twice! The thermometer in it is worthless, reads 9 degrees lower than the Accurite I put in it from Walmart.
On a late night whim I found a good deal on a Genesis and bought some hatching eggs from across the country. The eggs arrived 4-5 days late thanks to the post office. I set up the Genesis, filled just the #1 tray with water like it says for incubating, and it stayed right at 40-45% humidity, which is what I was going for, and the temp RARELY varied from 100 degrees. When it got below 20% I'd fill it up again and it went right back.
Of 48 eggs I got 36 to lockdown. Most of these are from my own flock and I have one poor rooster for 27 hens, so I'm not expecting perfect fertility. I'm not great at candling yet, and have some dark brown and dark blue eggs which I couldn't tell. Filled the #1 and #2 tray and humidity went up to 65-75%, which is what I was striving for. On day 20 TWO of those eggs shipped across country hatched easily. The reason I'm still up now is that 5 total have hatched, 17 have pipped and are active, and I'm still hopeful for the others because its just barely day 21.
I have been VERY impressed with this bator. It is forced air, has a tray in the bottom for clean-up, seals tightly, and preset for temp. Its also good for hatching in because it is deeper, the chicks are further away from the heat and air. The control is not easily bumped or changed, little fingers and interested helpers can't adjust it because they think the temp shows low. It has been great. I got the egg turner for it also which allows for a large number of eggs to start with. I have no complaints.