The first time I bought these at Costco, the lights just didn't work. Period.
I exchanged them for a second set. Have had them about a month now and the plug-in (In the top picture, the right-most component) randomly blew up and caught itself on fire. Luckily, I was in the room to put it out.
I love Costco and always will, but needless to say, I'm definitely not getting another set of these lights.