i have a a size 2 and its really really nice. very slim so would be easy to fold down for a tiny one, but also has nice long tabs so would last well.
i would certainly buy them over ll's, as they are a uk wahm, and remarkably well priced. (not to mention Cat's fabulous quality as usual.
the booster is loose like in a bambaneo i think, tho have have never seen one in real life!!