I bought my LG two decades ago. Hatched goose and chicken eggs in it with no problems. Then I stored it under Mom's house for a decade or so....the rats gnawed on it, but didn't seem to affect it too much when I recently dug it out and put in a new wafer AND an egg turner. Tried adding a computer fan, but I thought it was too buzzy and so took it out.
The first batch of eggs got cooked due to Springfield digital thermometer error. I kept cranking up the temp and it wouldn't read above 96. Ditched that. Went to K-Mart and bought a glass thermometer in a plastic base that also had a humidity scale on it. I totally FORGOT about adding water to the LG for the first 10 days of incubation....and in the desert that means some pretty dry single-digit humidity. Added water and then upped the humidity again at Day 18. GREAT hatch! I had even unplugged it and moved it into another room at lockdown.
The secret is making sure it's stable beforehand at holding temps (use a store-bought "stunt" eggs if you are worried). Make sure you have accurate thermometers (no digital) and have one on the floor of the 'bator and one riding the egg tops. Be sure the wafer is good. Look through the window at the seal of the top and bottom and if you see too much daylight (like where turner cord enters), then readjust the top or plug it with TP or something. Once it is dialed in, set and forget.....that is how hatching should be.
I thought about springing for a
Brinsea. But if it ain't broke, don't fix it and save the money. If it is broke, there's plenty of places to get replacement parts and they aren't that price-y.
I will use the LG until the styrofoam dissolves into a passel of little tiny balls....or until I win the lotto and Big-Time my chicken empire.