I've been using it for over 2 years now. It works only for Priority or Express mail. You must have a scale, and your own supplies. Its good, because it saves me from the line at my local post office. I drop the package on the mail box. There are no monthly fees. You pay as you go. The one advantage is that you have electronic tracking, though not that accurate. It tells you when the package is mailed, and when it was delivered, at no additional cost. This comes in handy when you use the post office supplies. Hope this helps.