I have. it is most certainly worth it. Chaos canyon and Poudre canyon are awesome; Camp Dick, Indepedence pass, Skyland, etc etc... Many areas are high altitude and great in the summer. The bouldering around Boulder is good too (flatirons etc) , though not up to the granite / gneiss stuff higher up. Don't let anyone tell you that Flagstaff is any good though.
I wouldn't like to comment about the quality of the urgent snatches.