Little Giant is not much loved around here. It is unreliable on temps unless you treat it JUST SO, it's made with cheap materials, and is hard to clean.
However: I've had great success using it as a hatcher and have found a way to get around temp fluctuations. I run it all the time with a thick terrycloth towel folded four times lengthwise (to make a nice, thick insulating bolster) over one half, leaving the vent holes open. The extra insulation seems to eliminate temp fluctuations. When I want to look in that window, I just lift the towel and look.
For the price, I think it's a decent buy, but my Hovabator is more reliable. I run most of the incubation in the Hovabator and then move the eggs to the Little Giant for the hatch. So I have not ever run an entire incubation through it and so can't speak to its efficacy on that score.
If I were to have only one incubator again, I would keep the Hova, even if I had to pay for it again.