Penelope and I scrambled up the Knife Edge after hiking to it from Piedra Lisa Spring TH where we left our car on September 2, 2015. Wonderful scrambling on some pretty decent rock. We did not use rope, but had a thin, 8mm, 30m rope with us. From the top, hiked over North Sandia Peak to the Towers, then down La Luz back to our car. 14 miles RT. Good day in the mountains.
Some incoherent tidbits below:
Class 4 all the way. Maybe you could call some of it 5.2-5.3...I never felt I was in a position where I was actually climbing. I feel Cabezon peak is harder/sketchier due to loose rock and exposure.
In truth a fall to the north of the "W" would not likely be fatal maybe 100 feet plus trees below (maybe it is 50/50). Really the first move on the "W" is the only sketchy part on the whole route in my opinion.
Bring climbing shoes, well worth it. Gives much more control and allowance for moves. They might not be necessary, but they surely help.
If you are a 5.9 rock climber or above, this is not a hard route. If you are not used to rock climbing, the drop-offs may give you pause and make the route seem sketchy. I feel a clear, climber/non-climber distinction exists for this route.
There is loose rock, I found a, maybe, 18"x18"x6" piece torn right out of the side of the rock. It looks solid, but all it takes is one loose one and...well you are at the bottom. Bring a helmet, there may be others climbing above you.
For me the route looked way scarier at the bottom then it was.
The scramble part took me about 90 minutes with breaks for pictures. No partner, no rope, just me my climbing shoes and my pack. I did it as part of a loop, from Piedro Lisa, to the North Sandia Peak, to the Sandia Crest, and down the La Luz. Maybe keep this one in your back pocket till after August 15th so you can couple the Needle and/or descend the creek beds in that vicinity. As it was, it made for a very long, yet fulfilling day.
Fun scramble with SP member davebobk47. Lots of fun, good exposure. Rope? not, the next time for me, but not a bad idea to have with you.