very wasteful if you use the pre-made k-cups, and the reuseable pack-your-own gives varying degrees of success but overall not great. I think it serves some purposes, e.g. in our clinic we have one out for patients because they don't drink enough or quickly enough to justify having a big ole industrial Bunn like we have for the employees (because we, largely I, drink a metric fuckload). I think it's pretty bogus for personal use, as someone who's had one.You know what really grinds my gears? Keurigs. That's almost a bigger scam than bottled water