Did someone in this group have a problem with a tree full o' bad bulbs?

I just found this gadget in a local Black Friday newspaper ad.

http://lightkeeperpro.com

The list is $30. Most stores sell it for $15, and the ad I saw had it for
$10.

I don't know if it really works, but I spoke to the company's owner, and he
seemed a rat-nice feller.