Product review (1 stars): Working fine in our old 1998 GE microwave for a month. UPDATE: Died within 1 yr.
Working fine in our old 1998 GE microwave for a month or so now.  No problem with brightness, can't tell it from original.

UPDATE:  This POS went bad after 1 year, filament broke.  Prior OEM bulb lasted 18X as along.  Didn't know I could use most any properly-sized 120V E17 base "bulb" so now trying an LED one (Kakanuo E17 LED Bulb Dimmable 5W E17 Intermediate Base Microwave Bulb).  My bet is it'll last a whole lot longer.