I have a hovabator 1602n with an added egg turner and fan. I had one poor hatch with it before and one really good hatch. Last time I tried to use it, the temperature spiked to 103 and I didn't get anything from that hatch. I'm trying to decide between getting a temperature controller (like this $30) to try to get the temperature more stable or just replacing the incubator with a low end one from amazon (like this $70). I will probably be hatching quail eggs for now, and I won't need to hatch high volume. Price-wise, the temperature controller will be cheaper, but $30 is about half way to buying one one of those cheap incubators that seem to get good reviews. Opinions, oh wise ones of backyard chickens?