Leapfrog Tag Reading System

So after researching the explorer and discovering all the negatives about them I came across this system.

Does anyone have one? Are they any good? How do they work? Is there a good variety of books available?

Reviews needed!

Thanks :)

My DS1 got one for Christmas. At first he loved it, but after only about 2 months he was over it. I've seen a lot of Disney books available, but I'm not keen on Disney and there don't seem to be other ones readily availble (I was only looking in Big W though). But it is fun for them. I'm hoping DS1 will get back into it. My niece (also 3) loves hers...

Dd loves them, she has a couple of the disney ones but also has the reading set and is doing really well with it now she is at school. The batteries last a long time, her favourite one is a map of the solar system she knows the planets and what they are made of.