So I wasn't going to buy one of these but now my baby is almost 6 months I've decided to bite the bullet and spend some money on one of these. They are quite expensive so I want to make sure I get one which is most popular the exesaucer perhaps look more attractive but are the Fisher-Price ones better? Also how old will my baby be when she grows out of this I don't want it to be a fad like a Bumbo and only last a few months!