I put out the feeder about 3 weeks ago and they are definitely coming, though I haven't seen as many this year as usual yet.
I'm having a problem with ants. I put some Vaseline on the metal pole the feeder is on and watched an ant cross right over it. My DH says I should have put it on a long stretch of the pole rather than gobbing it in one place. I've never done it before, so I didn't know quite how it was supposed to be done.