Bobolink Feeder????

Now that our Bobolinks have moved on I was remembering something I saw in one of my children's woodworking books. It has plans for a Bobolink feeder and a quick search shows a similar design online. Is that some type of gimmick or has anyone actually had these birds come to feeders? Oh, if they only would here and I could finally see these beauties up close.

I haven't heard anyone hear mention it before.

I doubt it is the feeder - it should be the food. Refrigerated or Frozen bugs are expensive, but might work.