I use an LG w/fan and I actual like it. My first hatch. Bought a new thermometer didn't check it for accuracy (because it was new so it has to be right, right? Ya-no.) Bator was holding ok, I was there to catch it if it flunctuated. Wasn't too worried. I was seeing growth and the movement was amazing. Day 18-lockdown 17 eggs moving and developing. I thought they looked a little behind in development but I chalked it up to inexperience and locked down. Day 24 I had my first egg hatch. Beautiful lively yellow chick. A second egg pipped and it hatched the next morning, but died within the first 24 hours. Nothing after that. Next day I discarded the eggs. (No eggtopsies and regretted it later.)
Now, I gave up, wasn't going to hatch ever again. Awful experience. Three weeks later my son and I talked and decided to try again. Bought THREE thermometers. Checked them (I learned that lesson.) Found that my thermometer from my first hatch was SIX degrees off. So when I thought my temps were 99/100 it was more like 94. It was a miracle I had one survivor. He is now 5 months old and beautiful. As a chick he appeared normal and healthy. Very active and (since he was an only) very people oriented. He was feathering out very slowly though. Around 2 months I started to realize the older (and bigger) he got the more effects I was seeing from his delayed development in the egg. He has balance issues. Never has used the perch in his quarters as he couldn't balance on it. Now at 5 months old he still has a significant amount of down feathers under his adult feathers at his back end and when he gets real active and running around he will mouth breathe from time to time. I attribute all this to the development. He is quartered in our playroom and I don't know if he will ever transition from home to coop this spring. I will try him out there, but I don't think his being with the other 2 roos is going to happen. He may need his own mini coop and run...lol We love him and glad that he made it regardless, but it just showed me the complications that I have to be prepared for if we ever have any more late hatchers.
(Second hatch=13/16. So glad we didn't give up even though it has given me another addiction...lol)