We got the Top Secret Adventures kits for several months. I thought they were wonderful and my DD9 enjoyed looking thru the book, doing the puzzles, etc. After the 4th or 5th one she didn't have the same level of enthusiasm, so I cancelled w/o any problems.
Last Christmas she got the Top Secret Adventures game, which we were just playing yesterday. You're on a mission to collect countries, 'suspects' and stolen treasure, so you have to look at the map to answer questions to get more playing cards. I would recommend this as a fun geography learning game.
For a while I also got the math puzzles books from Highlights. I think these are great quality and a good idea for gift ideas for your kids or nieces/nephews.
I would recommend Highlights books/games/toys to anyone. Ask them for a holiday catalog.
TxAg