We were advised that the UK ones are illegal and have bought an Aussie one. We bought a Peg Perego as they are made in Italy and it seems fairly decent. We did also notice that baby bunting are now selling a maxi cosi model but it is not the same as the UK one.
We are able to use our Peg at home though as it complies with UK standards, that only works if you buy it here as the UK ones don't have the anchor point attachment. I agree that the safe and sound carriers do look flimsy so we ended up paying more for an approved model made by european company, it did cost a fortune though!