I love Stella McCartney bags, and they are made very well. I'd rather spend extra $$ on a well made bag, and Im not at all convinced leather is any better than quality animal free or recycled materials either...we're not talking about walmart vinyl bags. I used to love my Balenciaga bags, but the leather quality went down as they became more popular so I had to be just as careful with them. I bought a 700.00 leather amenity kit that was a disgusting mess. That said, the SM bag looks nice, but I guess you'd have to see it IRL. If it looks anything like those dreaded Chanel garbage bags from a while ago, it's a no go....I wouldn't have spent over 1000 on one of those either, but I have on their large denim bag.
Also, where does it say that SM uses PVC? The research I've done says she doesn't (one source is here on TPF's blog), and at one time I think it was on her site that she doesn't use PVC or petroleum. Can you site your sources as to where there's that claim, and if this is something new?