My baby sits really well in this seat, and really wants to use it; he's not keen on potties. However, after a week or two, it developed a split right up the front; being a boy he was at risk of getting seriously injured in the split. It has split simply through poor choice of material; it is made from foam which just isn't able to support the loading at the narrow point at the front.
We had two of these (one for our house, one for his grandparents) and they have both broken in the same way, so definitely do not buy. We might try a Prince Lionheart Wee Pod to replace it with, which appears to have been made with some more suitable materials.