Months later, it seems to be holding up as well as the other fleece I from that batch. The interesting thing is that the micro-fleece seems to slough off hay easier than anti-pill. The hay doesn't cling like it does to regular fleece.
Of my older fleece, I'd say the anti-pill fleece has held up better than the blizzard fleece. The few pieces of blizzard fleece have lost most of their fluff. My anti-pill fleece has taken a beating and still looks pretty good. I will be interested to see how well the micro-fleece looks after a few years. All of them seem to wick moisture well.
If your guinea pigs have fleece bedding, what kind is it? Anti-pill? Blizzard? Micro-fleece? How well has it held up for you?