upgrading wheels

I'm considering upgrading wheels on my x-country mtb. I'm 6' and weigh
180lbs. I've been looking at Cane Creek's Aeroheat wheels. I noticed a lot
of places are selling them for $225 for the set. It looks like they used to
retail for about $420. Any opinions on these wheels? Are they worth the
money and will they do okay for a 180 lb cross country rider?

thanks,
-gabe