Wussed out on the 10c hand crack and did this. Super cool route, found the 5.8 at the end harder than the 5.9 pitch. Got some bad news at the top and ended up going extremely hypoglycemic with no food. Had to hustle kind strangers at the top for some food. Meg saved me here big time, I owe that dude a lot. Lead every pitch.
Finally summited the chief with Dan from a wet diedre with lots of crowds. I found the chimney to be the crux, especially considering the good pro and bolts around the crux of the 5.9 pitch. Topped out with 20 minutes of light to spare.
Fun day! Great variation of the Buttress and well worth a go. Despite the moderate grade I'm not so sure I'd recommend this as a beginner multipitch route... significant rope management and some exposed climbing with minimal protection make you earn every bit of 5.9 (although I'd probably give it a 10a). As the book says... it's "no cakewalk for the given grade".
Exciting climb, especially the crux pitch. Exposed and sustained crack climbing to a dyke traverse to gain the ledge. The offwidth pitch is tough to protect, but a #4 will work with a finicky placement.