I personally find the lower crux the most difficult (4th and 5th bolts I think?), but this is a great route with lots of fun moves that only get better as you go up. Started suddenly pouring rain for me when I reached the dihedral, but that just made the redpoint even better and kept away the gloom of having to leave the quarrry early.
So either I did something very wrong or taking the time to rest on this route really helped out. I felt that it was more like 5.10c personally. There were two great rest places making it more into connecting moderate boulder problems. The crux for me was getting past the left sloping hand rail. Once you commit to that move you have to get past it, because down climbing one or two moves would be difficult. The corner at the top made for some awesome stemming and then I reached above and got a bomber finger lock. I thought this was a very quality route.