I thought Fieldstone was a pretty good course, although I don't recall the greens-but, similar to what Dan said, getting there was the challenge. I played there about 4 years ago and was all over the lot-not surprising to some of you (Right, Joe and Mike?) I would like another lick at it.
Dan, I don't know, I found it penal, but I was really out of practice at the time. I'm not bashing it, I played like crap.
A higher-single digit marker from Commonwealth (no, not acer3x) played in our group, who said he felt it was harder than Commonwealth-he said CN was hard off the tee and easier into the greens, whereas here (Fieldstone) was hard off the tee and hard into the greens. (I know CN isn't H/F, he was just making a comparison to another area course many think of as difficult).
Slightly outside of Philadelphia, but easy to get to up 202, is Neshanic Valley, in Branchburg, NJ, which is public, so it's a bit dumbed down, but a good course-Steve Shaffer, Kyle, Cory and I have all played it and enjoyed it.