I have the Farm Innovators 4250. I bought it at Tractor Supply last month for $109. I like it very much. My first hatch that has been completely done in the Farm Innovators is due next weekend. It's a mix of my own eggs and some cheap barnyard mixes I got from ebay to try my hand at shipped eggs. Before this I used it as a hatcher during lock down for a couple of eggs I tried incubating in a food dehydrator (that's a story for a different post). I keep the incubator in a finished basement in a fully interior room with very little temperature fluctuation. It took me 2-3 days to get the temperature adjusted when I first fired it up. It's not a set it and forget it unit. You'll still need to be hands on and double check temp as often as possible.
I'm very new to incubating in general and the learning curve has been very steep. Read everything you can about humidity, air cells, weight loss, shell temperature, turning, candling and more. After my terrible first hatch (1 out of 20) I now weigh each egg every 4 days and take shell temps as needed. I also run 2 extra thermometers. One floating on the eggs and one measuring air temp. Realistically it's going to take me 3-4 hatches to get things really dialed in and achieve satisfactory hatch rates. That's learning how to run ,fine tune, the incubator and reduce human error as much as possible.
Happy hatching!