Pretty cool love my crock pots and will probably get one. But for frozen dinners and leftovers, I currently use a hot logic mini. Fits the whole frozen dinner inside. Maybe check them out. Michigan company and all made in USA last I checked.
I believe the idea is that you can plug it in at the beginning of your work day, and then by lunchtime you have a hot lunch ready for you. Probably makes the most sense if you work in a setting where you have to wait in line to use the microwave and/or have a short time to eat lunch.