Let's just say you get a lot more leather for our money!
I bought them at a specialist store: I actually went there looking for Kinvara 3s and asked to try one other model as well (New Balance with Vibram sole, forget what they're called). The dude brought me the Asics by accident, as the latter two were side by side and both neon yellow.
I had a bit of a run around in each, as well as the Brooks Pure something-or-other, and the Asics took it by the nose, slightly better for my arches than the Kinvara, and a bit more cushioning which almost made me forget my buggered knee.
I didn't mind paying a bit extra as a) it's a family business, and b) the service was superb. Plus I get my new toy now rather than whenever DHL can be bothered...