Over the years I have owned maybe 6-8 handmade WInslows. These are the ones that are marked E,D,C,B,A. All of mine were no higher than a B grade. The E's smoked just as good as the B just the B had nicer grain.
Every Winslow I ever owned was a great smoker. The only reason I sold all of mine was because they all had acrylic stems and they were all pretty heavy. I have no experience with their lower grade pipes but I would be willing to bet they make a great pipe for around 100 bucks.