08 or 09 Ksyrium elites

I’m considering a nearly-new set of Ksyrium elites and have options for the 08 or 09 models.

Can someone enlighten me what the difference between these wheelsets is for an average rider? I gather they are ~70g lighter due to the milling between the spokes.
The 08 set is about $150 cheaper than the 09; am I getting that much benefit from the newer wheels?

Thanks, Kevin

Anyone?

To me it’s worth $150 for the upgrade. You’re saving weight where it’s most important and if you’re talking grams per $ that’s a lot better ratio than a lot of other upgrades.