Stack'd has the same concept as Burgatory, but wiith less options. Basically, it's a build-your-own burger, so you can choose any kind of combination you like, and you can add fries for an extra dollar or two.
The strange thing about this place was there was no option for the way you want your burger done--they have a standard and that's it.
The burger was good when it came out, but service was a little slow and there weren't that many people there. I will definitely be back when I'm craving a good burger, but honestly, I'd rather go to Burgatory (except it's really far away from Carnegie Mellon).