This is actually something I had months ago, when I was in Toronto, but I remembered that I hadn't reviewed it yet. I found my tasting notes (recorded on my cell phone, of all places), so I thought I'd post it!
I love peanut butter. It's definitely one of my favorite foods, so I was really excited to see this KitKat in Toronto, even though it wasn't the freshest. We found it at a gas station, and they only had the one left because it was limited edition (I think). Therefore, it was a little stale.
The chocolate coating still tasted good, and was the standard milk chocolate. The wafers were okay as well. The peanut butter seemed to have suffered from sitting on a shelf, though, and was drier than I had hoped. At least, I'm assuming that was why.
Still, despite being past its prime, the peanut butter KitKat was pretty tasty! I hope Nestle makes these again, even though I'll probably never see them in the US. I don't know if it's fair to rate this bar, but I'll revise if I ever get my hands on a fresh one.