We use both. We are on our second (third if you want to count the replacement) B60. I'm a k-cup person. I like the variety, and only do one cup a day. Hubby likes coffee in volume, and uses the ground from a can because it's cheaper than the k-cups. If he could get it intravenously, he would. So he uses the My K-Cup for his coffee. I'm not sure what you mean by 'had any luck' with it. Are you talking about measurements? He usually fills it a little over 3/4 full and it gives him a large mug (press small twice). We had good luck with the My K-cup with the old machines, but we just got a new one about a month ago, and I have to contact Keurig, because it's dripping condensation when we use the My K-cup (not on the k-cup portions).
I hope that helped.
SOB