The rims are great. I used them for a year and only had to tune the wheels 1 month after building them. I am 6'2', 160lbs and ride a titus racerX. Used to race expert XC.
Unfortunately, injuries have kept from riding more than 4 hours a week for the past year so I don't have as many hours on those rims as I would like.
My friend who is racing Jr.X (he would be semi-pro adult) loves them but bent one right after building the wheel. It got replaced right away by Stan.