It was/is so enjoyable to build mine, I don't think I could ever use a factory-made incubator. My incubators work flawlessly. You can build one very similar to the one in the video but much more efficient.
I actually watched the 9 minutes of that video.
That type of incubator has hatched probably
millions of eggs across the world. Having said that, I would add some very inexpensive additions that will increase your hatch rate and make things much easier on you.
Many folks here use a $9.00 water-heater-thermostat from Home Depot or Lowes to control the temperature. Much better than poking holes in the wall of the incubator. Especially if the temperature of the outside air changes sometimes. Do a YouTube search for "water heater thermostats for incubator". Easy Peazy and the benefits are huge.
The other change I would make is adding a fan. The fan out of an old refrigerator or a computer fan (needs a transformer like a cell phone charger) works fine. I've seen people use the small personal fans like people use on a desk or something. Fans help eliminate hot or cold spots in the incubator.
The last suggestion is to cut up an egg carton to eliminate as much of the surfaces that touch the egg and still keep its strength/integrity. Put something under one end of the carton so that it tilts on about a 45-degree angle. Keep switching sides with your block rather than turning the eggs by hand individually every few hours. Go here for even more great ideas.
https://www.backyardchickens.com/a/homemade-chicken-egg-incubator-designs-pictures
Three cheap but very effective additions.
