Pros:
Plenty of challenge here, good variety of the types of shots required. From a purely technical standpoint, this is an excellent course.
Cons:
Not beginner friendly.
Signage is poor at best or was when I was there last - hopefully it has improved.
Several crossing fairways make it dangerous in places considering how frequently you have to throw hard.
The "beauty" espoused by so many in reference to this course is a misnomer. Unless you find hard packed dirt beautiful I suppose. Couple that with uncontrolled erosion, and I think the DeLa club is lucky the course hasn't been pulled - as I have seen such conditions be the cause for other courses to be yanked.
Other Thoughts:
DeLA was one of the early true distance courses, and as such - earned a reputation for its challenge. There really were very few or no other courses that matched its difficulty back in the 80's. Disc technology has caught up to it though, and it has been surpassed on many levels (beauty, technical challenge, variety, you name it) by a number of other courses.
Don't let the CONS keep you from paying a visit if you are in the San Fran/NorCal area - it is definitely a must play. But if MECCA is what you want, try Leister, MA, Charlotte, NC, or Paw Paw, WV