MacWorld has published some benchmarks of the MBA with SSD.
That is quite a premium price for only a 14% gain.
You can find the whole article here
MacWorld.com said:The first of our custom MacBook Air models has arrived—a $3,098 laptop with a 1.8GHz Core 2 Duo processor and a 64GB Solid State hard drive. Our benchmark results show that it outperforms a standard-issue MacBook Air by 14 percent in our overall system performance benchmark, Speedmark 5.
That is quite a premium price for only a 14% gain.
You can find the whole article here