Justin S.wrote a review of Patagonia Houdini Full-Zip Jacket - Men's on May 7, 2013
Yes the Houdini is great for trail running, cycling, and other activities where an ultra lightweight breathable wind jacket is desirable. However as a climbing jacket, the material isn't very abrasion/puncture resistant. You really have to be conscious of moves where the jacket may come into contact with the rock because it WILL tear. Patagonia sponsored climbers like Steve House probably take the Houdini along because they are not worried about trashing it; Patagonia will send them a free replacement. However for everyday climbers like me $100 is steep and its wiser to take use a slightly heavier but more robust piece as a workhorse jacket and save the Houdini as backup/ emergency for long routes on warmer days, belay duty, and other activities.