Did the Evolution a couple years ago in the late spring. The climbing isn't very difficult, and the route finding is easy enough for the backcountry, don't expect cairns. The descent portions will keep you on your toes, BIG exposure in sections. I would guess the climbing moves at 5.7-5.8, I used mostly knotted webbing for pro without problems.
Took 2 days, plenty of places to bivy. Bring all the water you plan on drinking.
Enjoy, it's a great adventure with a Euro feel.
Michael Dong