Bill:
I really enjoyed Old Memorial. Really great place and course.
It is a difficult golf course, but not overly hard, as long as your wedge and putter game are good. The greens and surrounding fairway areas if you miss the green can be challenging.
I played Concession GC the day before and Concession was much harder than Old Memorial.
You will enjoy it. Great locker room. Make sure you check it out after the round.