I picked up this feeder about two years ago on a clearance table for a couple of dollars, and kept thistle seed in it for weeks at a time, until finally pouring it out onto a ground feeder for the quail and doves who could be counted on to clean it up. I get larger American Goldfinches, but they seem to prefer the sunflower seed I put out for the other finches. I thought the thistle feeder was a waste of time and nearly threw it out. So I was tickled when this charming little group showed up a couple of weeks ago. I hope they remember this nice place where they found such yummy seed when they're passing through again.
UPDATE: The following day, I spotted the little finches foraging in the Russian Sage.