I have one and used it up until Starbucks came out with the Via. The Via is decent and so much easier to deal with that I haven't used the drip device since.

It did work well though, when in use. My only complaint was that in cold weather by the time you had a full cup of coffee it tended to have cooled down significantly and you needed to heat it up again. That was another reason to move to the via that I could just toss in the mug and put the cap on before it cooled off.