I missed it the first time it was offered in Canada, and I noticed they brought it back with the "Zinger Double Down". It's basically the same except with two "spicy" chicken breast fillets, with spicy mayo and pepper jack cheese. I ordered it with a Poutine.
I wish I could really review it, but all I could think while I ate was "Why am I doing this to myself?" I can't even remember was it is like to be completely honest. But I know that I'm never going to eat one again. There is definitely such thing as ""too much chicken" and I learned that the hard way.
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http://soundcloud.com/thundersheep/lunatic-asylum
http://soundcloud.com/thundersheep/summer-rain