After reading the instructions, and the reviews/suggestions, and some trial and error, this works great for me! I drink over 4-5 cups per day, so this accessory is going to save me tons of money by using my own coffee. No drips, no coffee grounds in my cup, and great full taste. Definitely fresh ground beans taste the best (using grind setting between drip and espresso), and filling the cup (loosely, not tamped down) to about 1/8" from the top is my preference. I also used the suggestion of cutting the top rim off a used K cup, and inserting the empty bottom part of the cup into My K cup holder - this allows the water to stay in contact longer with the coffee, resulting in a very rich brew without building up to much pressure. For Christmas, I got my Keurig machine, my K cup accessory, and about 160 K cups of various flavors, as well as a couple bags of whole bean coffee and a new bean grinder. Santa was VERY good to me this year!!!