I'm pretty late to the party in trying this kind of KitKat, but even before trying it, I was sure this would be a case of "better late than never." On a mini-vacation to Toronto, we stopped in again at the Pacific Mall, and although many of the items are of Chinese origin, the selection of packaged snacks and candy is dominated by Japanese products.
Most of the comments I had read on Flickr and in blogs for this KitKat were pretty positive, and I am a big fan of chocolate cookies (I'd prefer Oreos without the cream, I think), so I was fairly certain I would like this flavor. It did not disappoint!
The bars smelled like hot cocoa, very rich and chocolatey. They tasted rich and crunchy, not too sweet, and even a little bit bitter. The flavor of the chocolate cookies inside and the chocolate outside went together very well. I couldn't taste the wafers, but their texture also complemented the cookies.
I only got one box, since I'm trying not to overload myself with snacks, but I wish I had bought more of these. Cookies+ is definitely a new favorite of all the 40 KitKat flavors I've tried! I actually have a spreadsheet to keep track of them. Anyhow, this flavor was a fun departure from the normal KitKat fare, and I recommend trying it. Check out ZOMG, Candy for more thoughts on this KitKat.
KitKat Website (Japanese)