We have long sought and tasted some toilet seats All have wobbled, rattled, while the bargain scratched our toilet seat. The problem with a little boy and toilet seat have already some other erörert in their reviews ;-) In short, even with us something went wrong. Our son loved the rickety seats also very uncomfortable, what the dry Will has not made it any easier. So we have always been looking for the right parallel toilet seat - and found him with Baby Bjorn toilet seat! The many positive reviews were decisive, despite steep price to try and we were not disappointed - on the contrary! We have two different sized toilets in the main and guest bathroom, and it fits perfectly in both the adjustment. No shaking, rattling and scratched the toilet seat not - through the existing rubber edge and there is nothing more wrong! Is also of better, more massive than the lower quality seats, which we had tried before. Therefore equal yet bought a second for the guest bathroom. Finally, we have installed in every bathroom a hook and our son hangs the seat "day's work" also proudly gone to the top of existing rubber ring (see picture in the product description on Amazon). Absolute buy recommendation - price worth it!