Learning Game Consoles for Young Children?

revco_38 asks: "My wife and I are looking into purchasing a game based learning console for our 4 year old boy this Christmas. The two front runners are the VSmile from VTech and the Leapster from Leapfrog. Does the Slashdot community have any experience with either of these products? Are there any other products similar that should be considered? We also have a 2 year old boy so something that lasts would be nice."