I have leappads but one thing I would look into is that at least with mine instead of buying the cartridge I just download the games from the app store, leapfrog allows you to download to 3 devices at once,so you don't have to buy multiple cartridges or risk the kids fighting over one. I would assume vtech does something similar
we had some repairs being done to our car yesterday, so we got a rental. one of these was under the backseat. I had to see what it was all about to see if this would finish up my holiday shopping for my 3 and 5 year olds. I'm glad I tried it, because they would have been very disappointed with the quality and loooooong loading times, even to go back to the home page. we have a samsung galaxy tablet that they often use, and this would have been frutrating for them. the video quality is not that great either and that would be one of their favorite thing to use. bottom line is that I was glad I was able to try it before we bought them, because they would have just sat on the table for the next year.
you can purchase apps online, or you can use cartridges. the one we saw yesterday was using a cartridge. and the rental agency was forever grateful that we found it, and returned it.