Yes, I am also highly anticipating the SS'10 collection launch - Luckily they opened a new Paris store right in time of when the debut collection hit the shelves worldwide so I could check out the pieces in person (I ended up buying the antracite wool military blouson and a white shirt with bold black stripes... both pieces have become 'faithful friends' already).
I wasn't too sure how this would turn out next to the highly disappointing H&M designer collaborations that mostly looked trashy and poor in the detailing, J+ however is a real delight up close... beautiful, tight stitching on the shirts, premium YKK zippers and nice fabrics - These pieces are definitely nicer than most secondary line designer collections, such as McQ, Coming Soon by Yohji or Comme des Garcons Shirt (especially since the price is considerably better).
The only pieces I didn't like; the stretch cotton jerseys as well as the denim... but this being just the first season, I am sure there's room for improvement... Also - has anyone seen the two dresses on? I think there's a cotton shirt dress with a keyhole neckline and a belted waist that looks nice and incomplicated... I could see that looking smashing both with a pair of tall boots from Ann or a pair of nice Pierre Hardy flats!