I walked into my first 5 guys here in Salt Lake City yesterday arvo wearing an in-n-out T shirt and got myself a burger and fries. The manager/owner rocked up part way through the order and said something like "Nice shirt, but I don't know about in-n-out, if I give you this, [5 guys T shirt] will you wear it?" and pushed a 5 guys T shirt across the counter at me - "Yes, of course! :-)" so now I have two shirts, I wonder how many 5 guys shirts I can get by repeating the experiment across the east coast?
Summary of in-n-out vs. 5 guys is:
They are different things catering to different people and needs.
The 5 guys burger is a better burger, a real burger, and priced accordingly, whereas the in-n-out burger is "fast food done right" - ie, it doesn't suck, but isn't spectacular. Someone that posted above already said something like this though.
I'll be getting some 5 guys burgers in future for sure, but I'll still love in-n-out for what it is.
Other points of interest :
5 guys fries only come in "way too much for one dude" size (at the smallest)
5 guys have no shakes
That is about all I have to say on the matter till I post the somewhat staged pics :-)
Fred.