R.G.
My son (who is six and a half) received a V smile TV game system several years ago. Within the last year and a half was when he started to show interest/ability to handle it. We love it because he can play educational games with characters that he loves. And hopefully when he outgrows it and moves on to "other" gaming systems, my daughters who are 4 and 20 months can enjoy it as well.
I'm not familiar with the Leap Frog system, only their videos and developmental toys, which are incredible.