Mark:
I played Sage Valley last summer. It is a Tom Fazio design. Upscale private club. They have a caddy program and the layout is such that walking is quite doable, especially with a caddy - though the course is fairly hilly.
Based only on my single round there, I would describe Sage Valley as a very good course - certainly not great but certainly above average. My impression was that it was simply a good, solid golf course, without some of the "eye-candy" type stuff you seem to get with Tom Fazio courses. The course played nice and firm, at least last summer - we have had a wet fall-winter and all the courses are soft now.
Bottom line, if you are in the area and have a chance to play Sage Valley, it is a very nice way to spend a day - but I would not go too far out of my way to play there.