Nantucket and Breakfast Blend are both very mellow blends, on the box, it will say light roast. Many others will say Medium roast and they are much stronger, thus , to me anyhow, bitter. There are many brands other than Green Mountain too that have K cups and Vue pods to use in your Keurig brewer. Kroger has their Private Select brand and the Breakfast Blend is wonderful. It is deeply rich, but no bitter.