This is not bad, but has one problem. How many watts I have to use to heat up my dinner? Watts are not a natural thing that any human knows how to relate to any experience. Of course, with some trial or guidance, I could figure it out. But even then watts are useless for me - I just know 600w means "dinner", but it could as well say "37 zzq" and be as useful as "600 w".