I've been using an LG; no fan, no turner. All manual. It's a fight to stabilize; not only is it hard to set and extremely touchy, but if the house goes up 5 degrees, you can bet your incubator's gonna go up as well! I dry-incubate, monitor air pockets every few days, and fill all trays at lockdown. I've had 99% hatch rates with stable temps, but I've had hatches spike to 105 and lost 60% of the eggs... I keep the incubator in a closet in the most stable part of the house, but my house may fluctuate between 60-70. I don't have AC, so I can't cool it down. If I notice it's a warmer indoor day I need to actively regulate the unit's temp.
If you want hand's-free no-fuss incubating, don't go for an LG. But they're simple, hard to break, cheap, can hold a ton of eggs, and they do work!