Hovabator or LG, they still get lumped together under the same category as being unpredictable and the source of many a bad hatch. From what I can see, a large portion of the problems with these incubators lies in the operator, especially the first time operator. They are reasonably priced for the first time incubator, the documentation is written in such a way to make you think that it's just a "pop in the eggs and forget it" process with very little practical advice and instructions for handling the eggs, temperature regulation, and humidity levels as well as conflicting temperature recommendations for forced or still air styles all in one little book. Add that to the first time jitters, impatience for seeing that first chick come popping out of that shell, and the standard habit many have of placing that rather useless direction pamphlet to the side after getting just the basic "start-up" steps over with. In essence, what you have is a multitude of things that can go wrong. All the ingredients for a hatching disaster are right there waiting to do their thing.
I've been keeping track of how many eggs I have set and hatched in mine and, not counting the occasional infertile or early quitter, I'm running a 80% hatch rate with all but one batch of eggs being sent through the PO. The majority of the eggs have been for a friend and a couple of neighbors but I have run over 250 eggs through that LG sucker in the last 6-8 months and it's been everything from cardinal eggs (a clutch of four eggs that my dang cat knocked out of a tree), various quail, just as various a selection of chicken, and 7 turkeys. Haven't done any duck or goose eggs yet but figure my mom or sister will come along with that request eventually. Am I just lucky? Maybe but then again I try not to fret over every little thing and other than adding a little water, the occasional egg I have to hand turn (either because I can't figure out which end is the pointy one) or possible ruptured air sac on a shipped egg, I leave the darn thing alone. Having three kids, two of them with autism, patience is no longer a virtue here, it's a requirement for sanity.
My hubby has nicknamed my LG the Styrobroody. My putting decals and stickers of chickens and quail around the sides may have had something to do with that. Sounds better than styrocrapbox but amounts to the same thing.
<dang typoes, edited to fix 'em>