Mark - I played Rochester about a month ago and it's pretty impressive. As a native Midwesterner, I don't have much Tillinghast to compare it to, but it is a tough walk.
In terms of holes, I'd start by saying I enjoyed the par fives, which I rarely single out as good holes. There are only two and you're done with them by the sixth. Four bends left the whole way and plays over two valleys to a high green; I found the approach terrifying for some reason. You drive from a hill to the lowest-lying portion of the course. The green impressed me, especially as the recent expansion added a front finger pinched between the fronting bunkers. It's an awesome pin position.
I also really enjoyed fourteen. The set of par threes is more than the sum of its parts on account of the variety in length, direction, and look, but fourteen was my favorite. It's uphill to a hilltop green and misses short, left, or long leave a brutal flop.
A final excellent green site is sixteen. It's on the edge of a hill and affords a cool view of the rest of the property and surrounding land. It also allows the ground game and runs sneakily away from the player.
The rest of the course is of equal quality, and everyone I met at the club was welcoming. I'm interested to see what the consensus is once more people see it. Personally, there are only a few places in the Twin Cities I'd play before driving down there.