It's not a bad ripoff of Chick Fil A's sandwich. I don't always remember to tell them to add mayo, which I can't believe isn't already on the sandwich...it's pretty much a chicken sandwich staple. For that reason if nothing else, I'd go for Chick Fil A over McDonald's sandwich.
I also tried Burger King's new one, which is WAY out of balance. Too crunchy and the chicken was way too thick for a fast food chicken sandwich. It almost seems like they try for the biggest chicken breast they can find, over-bread it and fry it and then try to fit it on a bun. Never again.