I spose of the true (you can't count places like Sunningdale & Walton Heath because the new courses are just as good as the old courses) second courses out there that I have seen Portrush Valley has to be one of the best even though I detest all the drop shot par 3s which is most unusual for Colt. I think Saunton West is just as good if not a bit better than the Valley. After these two, the only one I rate is Burnham's Channel Course 9 holes), but it is too narrow with a decent breeze so it is well behind the other two even though it has a few corking holes. I spose Merion's West course is another one worth mentioning, but I didn't get a good feel for the place.
I was left truly unimpressed with the second courses at Dornoch, Troon, Ballybunion, Lahinch and Cruden Bay.
Ciao