Before I get to the sandwich itself, let me just say that the process was handled very well by the restaurant (or, in this case, the food court stand). They were making the sandwiches fresh, but had them quickly from the time people showed up to get them. In addition, when I was done with my meal, an employee actually came over to my table, offered me a mint and refilled my drink. I can honestly say that's never happened to me at a fast food restaurant, much less one in a food court.
As for the sandwich itself, it was good. I got mine with pepperjack cheese, which really amped up the spiciness (and for the sake of completness, I should also mention that I passed on the lettuce and tomato, and removed the pickles. Your milage may vary, depending on your choice of condiments). Interestingly, the first few bites didn't seem that spicy, but I think that has to do with Chick-fil-A's bread, which is incredibly sweet. However, the sandwich got noticeably spicier with each bite, and retained that spiciness through the end. I'd describe it as a slow burn spicy, so it's nice to have waffle fries to mix in between bites (though, honestly, it's nice to have waffle fries in general).
In the end, I'd say the sandwich was sufficiently spicy to warrant having a drink (which I did) but not so spicy to render it inedible -- or to mask the great taste of Chick-fil-A chicken. It's a good addition to the menu, and a nice change of pace for those that regularly eat at Chick-fil-A, but not so outstanding that it will displace the classic chicken sandwich for those of us who only get there once in a blue moon.
Also -- and this is tough for me to write, given how much I love Chick-fil-A -- I'm not sure this spicy chicken sandwich is markedly better than the one offered at Wendy's. That surprised me, given how much higher I'd rate Chick-fil-A's classic chicken sandwich over ones offered at any other restaurant, but it's the truth. Maybe that just goes to show how much I like the Wendy's Spicy Chicken Sandwich (my style: no tomato, no mayo, add bacon), or maybe I'm just rationalizing the fact that it takes me six minutes to get to the nearest Wendy's, but two hours to get to the nearest Chick-fil-A.