J.E.
I don't know anything about the Tag system, but my daughter got her first Leapster when she was 3 as well, and it's been the best thing ever. It keeps her busy at restaurants when we're waiting for food and has a ton of different games (in fact, her cousins and her faught so much over the system that we had to get each their own). Anyway, she finally wore out her first one not too long ago and got a replacement one from grandma for her 6th birthday and she STILL can't put it down. It's the only toy that hasn't been put aside shortly after her getting it. I highly recommend it!