So rather than doing the work I should have started two hours ago, I'll tell you a little about my jam!
I cracked open a jar of the Cento Pectin version and was surprised that there was as much body as there was, although I deem it still not quite thick enough. I like the flavor, bright and sweet, although to my taste it's too sweet to put into yogurt (don't ask me why that is...) Good color and I like the mashed berries which adds to the consistency. All in all, it's not bad, but I love the simplicity of the Joy of Cooking recipe, so perhaps next year I'll try doing a mash with the JoC and see how that goes.
It'll probably take me a while to get through this jar (a girl can only eat so much toast!) but when another jar from another recipe is cracked open I'll let you know.