Five Guys has been showing up in multiple places in Southern California and the first place I've seen/had it was when I went to Washington D.C.
I was with a native Washington D.C'er and she mentioned it was comparable to In-and-Out Burger. She also said it was like the East coast version of In-and-Out.
The French Fries are, and always will be my favorite part of Five Guys. I like the color and crunchy bits of it. I haven't tried the other seasoning of it but the original is really good.
In my burger, I got mayo, lettuce, pickles, tomatoes, grilled mushrooms, ketchup, mustard, and A1 sauce. I was most excited for the A1 sauce and I love the flavor it gave to my burger.
Overall, not the healthiest food place to go to, but it is worth a try if your a big fan of burger places/fast food places. As for the price, it can get expensive depending on what or how much you get.
As for the question if it's better than In-and-Out Burger?
Five Guys wins for the size comparison, however I can't help but prefer In-out-Out Burger over Five Guys.