The Flying Nun 

Did this route 10/8/09/ "North Face Right" in the book I believe. Sharp calcite. Harder climbing starts at about 30' with mediocre gear and a potential for a fall to a ledge/corner. Sustained. Felt harder than .10a, but still .10-range. Not an easy .10 for certain. Aside from a medium and large (2, 3 Camalot) to start, we were all small gear - yellow/orange/red Metolius, 0.5 and 0.75 Camalot, and a few draws for the merge w/ Holier Than Thou. Despite this long description, I would not recommend this route unless you like long approaches for 1 or 2 star climbing. (Full disclosure: we're a bit weak these days)

I felt that the climbing on the first two pitches was solid, sustained, and "in-your-face" for the 5.10a rating.
The nature of the route is odd for Castle Valley. The majority of the route is face climbing on sharp calcite while clipping bolts!
The belay at the top of P1 is an uncomfortable hanging belay. The first few moves on P2 is the technical crux in my opinion. P3 is short with only one move of 5.10 at the top of a tight hand crack.

Bring quickdraws, a set of medium/large sized nuts, double cams from tiny to a #2 camalot, and also a #3 camalot is handy for the bottom and the top.
Rap the route. Double 60's will get you down from the top of 2nd pitch, avoiding that 1st belay.

All in all, it is a long hike for OK climbing. But it IS an official desert tower! Kind of...