I bought us a Keurig for Christmas last year, and it saves us time and money - no more 6-cup brews just to get one (at the most two) cup of coffee.
I got it on special at a department store for $89 (less a $10 rebate), and we have not looked back. My wife likes string coffee, so uses both the KCups and the personal-fill accessory (My KCup).
I saw that some people had problems with the needles clogging, but I don't think they can make so many of these machines without a few defective. The owners seemed unable - or too incompetent - to clear the needles with a paper clip as instructed.
The accessory "My KCup" comes in 3 pieces - the cone, the bayonet-connect cap and a mesh filter (lioiks like a tiny version of the wire mesh filters in the big models). I bought an extra pair of these wire mesh baskets.
If you like your coffee strong, over time you just have to experiment and come to know how much coffee to add to the mesh filter and you will no longer need the KCups again. My preference is for one slightly rounded teaspoon of Fine Grind.
I don't like mine bitter or sharp, so I drilled a 1/2 inch hole in the bottom of the mesh filter (it's plastic, not wire) and use it just to hold a paper filter in place. I started with the Number 1 size (pre-formed, not a circle), but they are getting kind of expensive (and rare) so I tried the number 2 filters (also pre-formed) and they work just fine - even the cheap yellow-label no-name ones.
I start by folding the bottom up about 1/2 inch, then the top across enough for the basket to fit, then the other end over that. Open the filter top and space it out with your finger, push the basket in, then push basket and filter together into the cone. Add your coffee, then the cap, and make a brew.
I find the paper filter gives me the strong rounded flavour like I get in the store, but with the mesh alone it's too harsh for me.
I hear tell that for a true cup of Timmy's you should put a few drops of maple syrup in the bottom of the cup before you brew... works for me!!
BTW, I looked at all the other devices on the market for making your own coffee in a Keurig - don't waste your time and money. The My KCup is very sturdy and works just fine.