Custom, I tried it a couple times and had the same results as you: great juicy chicken with crisp skin, but no additional flavor. Plus I had a few scalds from trying to de-beercan the bird after the cook. I basically gave up on the idea, and then found this write-up that supported what happened with my cooks (chicken is my favorite thing to cook/eat):
Chicken is my favorite meal, bar-none. There are much better ways that beercan.