This is a very challenging hike and a great accomplishment to finish.  The hike up to siphon draw is deceiving, it's as high as Camelback but its only about 1/3 of your climb up to Flatiron.  Climbing up boulders, jagged rocks and a constant incline are your challanges on the way up.  View from the top is spectacular when you arrive.  Took 2 hrs and 10 min to make it up to the top.  Spent an hour and a half at the top taking in the accomplishment and getting the team together for a photo.  The climb down is just hard.  The same climb you just made going up you need to make back down.  Some spots with very slippery pebbles are difficult to navigate.  Great hike.