I just purchased my first pair from the barney's 40% off sale, and am having some guilt now. I have never spent this much on a pair of flats! are they worth the $$, if so why? I know the soles are thin, and i plan on getting them zip soled. how long will this ensure their longetivitity? and what makes lanvins so much better than other flats, say in the $200-300 range originally? (ie. repetto, etc...). Maybe i'll see for myself when they get here...I hope!