Really? A must do 5.4 in Yosemite? Come on!
Seriously, though, this has got to be one of the most beautiful climbs I have done in Yosemite. It is also one of my favorite chimneys. I had read about it merely as an approach to setting up top roping anchors on Chingando, and I was pleasantly surprised to find the chimney to be clean, bright, fairly tricky, interesting for "only" 5.4 and a fun caving adventure in it's own right.