I have about 7,500 miles on these wheels and can't imagine buying a different wheel to meet my needs. I'm 6'3" and 195 lbs and ride about 3,500 miles per year. I have only had to true them once, but that was very minimal work and more of a "hey, can you true my wheels while I have my bike" in the shop. The only negative thing I can say about these wheels is the rear free hub requires maintenance about 2 times per year to clean and re-lube the free hub. I live in a very dry climate where it is recommended to do this 2x per year if you ride a lot.
Another minor complaint is that the bladed spokes get caught in the cross winds more so than a set of wheels with standard spokes. I ride these on gravel roads, up long mountainous climbs, down long mountainous descents, and hardly notice any flex either. I've had the Aksiums as well and there is a very noticeable difference between the Ksyrium Elite's and the Askiums (weight, flex, rolling resistance).