I don't have a top hatch either, but from some of the posts I have read on a Brower top hatch incubator there are issues, but it does work....It has a light thats annoying...it doesn't hold temps well and a jacket of sorts has to be used...either from bubble wrap or a blanket jacket...works better if its in a room with consistent temp...Some people like that its dishwasher safe and easy to clean after a hatch...it's just that some people like it and some don't on some of those factors...Try seaching incubators here in the search topic and see if something comes up...