i installed these on a low-voltage recessed lighting system in my kitchen, on a Lutron Maestro MAELV switch.  Dimming works well, there is no audible buzzing at all.  Color is warm and comparable to the halogen bulbs that I replaced with these LEDs.  Only issue is that 3 of the 10 bulbs had metal pins that were slightly too short, and wouldn't lock into place firmly in the fixture, so they couldn't be used.  The other 7 in the package were fine.