Bike seats for bigger kids?

I have been contemplating getting a seat for carrying my kids (aged 4.5 and 7). The BoBike Junior would be a total no-brainer, if it weren't for the price. So I have been looking for an alternative product.


I think I might have found it in the Leco Top Tube Child Seat, which is reviewed in the amazon.co.uk listing and on first4dads.co.uk. Most of the websites that sell it ship only to the UK, but there is one seller on eBay who will ship it worldwide. But here's what makes me really nervous: I can only find two photos of it in use and another two in the wild online. Does it not actually get used because it's uncomfortable? Do kids outgrow it too quickly?


Anyone actually have experience with bike seats for bigger kids?