I've heard good things about the Five Guys, they opened one in Austin and a friend of mine seems to go there a couple of times a week. THey have spicy fries. I like spicy fries.
I went to 5 guys tonight and it was great. their burgers are excellent and the fries are great to. I ordered both their regular fries and the cajun fries and I gotta say the cajun ones just had to much seasoning for my liking (not so spicy but imagine dumping a lot of season salt on them). If I had to compare them to In and Out I would say equal or better just in a different way. I would definitly recommend them to anyone wanting a good burger. Better than any restaraunt burger that I can remember and at $5.89 the price wasn't bad either. But the fries were something like $3.99 which I thought was a bit over priced for potatoe.
I took the other half and we both got the bacon cheeseburger fries and a coke and the total was 23 bucks so it was a little pricy but good food.