Since I got the new burr grinder, I've been experimenting with different brands. Nothing special, mostly what is on sale at the grocery store. I recently went to Whole Foods to see what they had, got a bag of 365 Island Blend City Roast. So far it is the biggest fail, it seriously upsets my stomach. No idea why. The taste is ok, but it really disagrees with me. I find I am less of a fan of the dark roasts, they tend to taste burned. I think the medium roasts suit me the best.