Our 12 year old Maytag MMV5156AAW stopped heating and being in the 'replace' rather than 'fix' mode mindset for microwaves, my family was overjoyed that I was finally NOT going to attempt to fix something that was broken (I pride myself in being able to fix just about everything around the house). After looking at new microwave offerings, I was convinced that new ovens may not be as sturdy as our Maytag. Not to mention, saving a few hundred dollars and disposing of what would otherwise be a perfectly functioning appliance was a consideration.Armed with the precautions of working around a very dangerous 2,000 volt capacitor, I tackled and completed this project with the new magnetron. I did need to trim 2 of the steel mounting tabs a bit to fit (this part most likely is used in many applications), but I don't consider that a negative. If you are in the same mechanical mindset as me and don't mind the capacitor danger factor, trimming a couple of mounting tabs is no big deal. Otherwise this replacement magnetron looks exactly like the one that I replaced.My family is glad that our microwave works again, and there is great satisfaction in knowing how this very simple machine works. That makes me a Happy Dad!Jan 2015 Update: It is still working great and doesn't have the buzzing "The magnetron is about ready to fail" sound. Everything seems to heat as quickly as when the microwave was new. Still very happy with this purchase.Go for it----fix your microwave (just be cautious about that capacitor!)