We've been using it this year.
My dd loves getting her packet every month in the mail. We like the little worksheet with small activities. We have liked the "bigger" activities too (origami for Japan, excavating a pyramid for Egypt). My dd loves the little suitcase and is eager to find the country on the map each month.
We don't like the online activities. Maybe we should give it another chance, but the time we logged on wasn't fun. It was just a quiz format. My dd doesn't read well enough to read the Q&A by herself and there wasn't an audio button.
To be honest, the program is pricey for what it offers. I do like it though because it acts as a topic springboard for us. My dd gets excited about the country simply because something comes in the mail. I wouldn't get half the reaction if I just decided that we would do France in January and Egypt in February, etc. I usually add a book or two from the library. I try to find a non-fiction one about daily life and a folktale or other story from the country. When possible, we watch a short travel dvd about the country, look up landmarks, and sometimes try to cook a dish from the country. When dd finds the country on the map, she also identifies the capitol, continent, and prominent borders.
Amy