I just built my own first incubator out of a half size dorm fridge. I have used hovabators, and other types of incubators and BY FAR the incubator I just built is the best and it all cost 120.00 including the fridge, heat, tstat, shelving, fan everything I'm really happy with it. It took zero calibration. My other incubators including a hovabator needed to be fiddled with to get them right. If you have the time to save yourself some cash and do it yourself. Do it! After i got all the parts it took me an hour or two to set it all up and then a test run for a day and then eggs went right in to it. I love it. My biggest problem with the other incs was they held one clutch. I'm expecting 8-10 this year. There was no way I could hold that many and I wasn't going to buy another incubator. The diy incubator hold 20 clutches. Diy rules!