Got 2 micros. both old, and big. the sharp is huge and about 15 or so i think.. the Panasonic is nearer 30. both microwave fine and been well looked after.
I used to fix the once upon a time, when the company I worked for leased them to big hotels.. the catering staff really abused the but they lasted a decent time. They all leak to a degree, but the radiation depletes greatly over a fairly small distance so if you are not overly close to it you will be fine