Just a random note while I think of it as I sip my coffee this afternoon.
If you buy a My K-Cup, don't buy fine grind coffee, or grind your own coffee really fine. It absorbs more of the water, the coffee clogs up the filter, and causes your machine's descale light to turn on.
I wasn't thinking when I came home for Christmas and in an exhaustive state picked a coffee I thought would taste good (PC Fair Trade African Medium Roast) which for the record is good, but likes the play havoc with the machine. I won't get a full 10oz cup
So medium grind, stay away from fine grind.