Thanks the reason I asked is complicated. For 5 years I only smoked Red Ribbon and 5100 (mostly red ribbon) 2 years ago I was asked to try a few ounces of 507-C which I thought at the time was awful. I rubbed out the remainder of what I had and jarred it. Cringle Kake arrived and reminded me of the McClelleand reds. Today I pulled out the jar of 507-C and loved the sweetness 22 months in a jar had given it.
I don't care for 507-C when it's fresh. The acidity level is too high. I smoked some seven year old a few years back, and it was wonderful. I have a couple of pounds aging in jars. That's the best thing to do with them, in my opinion. But they still aren't anything like red Virginia blends, of course.