Five Guys Burgers & Fries opened on the lower east side a couple years ago, but after having gone there once, I found I'd much rather go to the Sonic Burger drive-in the next block over.
[size=8pt]Seriously, the hamburgers aren't much different between the two places, but the prices very obviously are. I can get two double-bacon cheeseburgers and large boxes of chips at Sonic for the same price as one regular hamburger and order of large chips at 5GBF, making the latter totally not worth it. And Sonic Burger have "ice cream" desserts, which 5GBF can't claim to have, at least not when I went there last.
Your results may vary!