Personally, I own about 5 or 6 issues of Dungeon (a couple from the 2nd edition days, and a handful from 3rd). The last one I bought was probably a year ago. I have used a whole adventure from one, and maps from two others. While the magazine is reasonably interesting reading, I don't get much utility out of it. I like writing my own adventures, but in the rare occasions when I don't have time to, I usually grab a free or cheap one online. Poly doesn't interest me in the least.