Does anyone have one of these? Is it any good? They are on sale in a shop near me and I can't decide whether to get one or not. My little one (19 months) loves books and interactive toys... but not sure how much she'll use it (and they are still quite expensive, as are the extra books you have to get). But the sales-person reckoned she'd be using it until she was 3 or 4, so would get a lot out of it!