This is a late review seeing as how the limited time offer is over with now, but I'll be reviewing it regardless.
I read a few reviews here and there and I saw a lot of people displeased with this sandwich, so I figured I'd offer my own opinion. Basically, I chose to get the sandwich grilled because I figured the breading on the chicken would just all soggified with the marinara on it.
First of all, I think Burger King probably has the best fast food grilled chicken. Many places have their grilled chicken seasoned with nothing but salt, but Burger King's has a distinct grilled taste to it, so that helps this sandwich a lot. The marinara sauce is obviously not of the best quality (it tastes like it was out of a can), but it's tolerable. The only issue I have with this sandwich is the parmesan shavings that add absolutely nothing but calories and a waxy texture.
I'm actually sort of disappointed this was a limited time item. I had a couple sandwiches, and I'd probably get more now and then if they were still available.
+ Burger King's chicken.
- Waxy, flavorless cheese.