I am a bit surprised nobody has mentioned the tremendous amount of garbage these things must be generating. Those little plastic cups add up if you use 365 of them a year. Sure they may be recyclable (not even 100% sure the are with the foil lid), but it is sad what a small percentage of the population actually recycles. If you do go this route, at least use the re-fillable cartridge.
Do a google search for Penn & Teller's Bull**** about landfills.