Just thought I'd update on my findings:

I've decided against getting a leap pad, I've read a lot of negative reviews. The batteries, as a lot of you said, don't last very long at all, and the apps for it are very over priced in my opinion (some are up to $50!). I'm now looking at getting an ipad ad putting a bunch of kids apps on it, however this will be for the family, so not suitable for my little man's birthday present, so it's back to the drawing board!