I have been to several of the Five Guys locations in Pittsburgh. The best ever lunch at a Five Guys was in the Atlanta Airport. Less greasy then most I have ordered. The Monroeville location is the one that the family has frequent the most. The downtown location is great for a lunch break during family business lunch time. I am a little bias because of a family member once was a Manager of the Five Guys restaurant group. He has since moved on to somewhere else in the food industry.
I am not always hungry for the juicy burgers that they serve, but I do order the hot dogs and I love the fries. I do like that the fries are cooked in peanut oil. We have never ordered online, but I would think that most would find that convent if not eating in. Something to consider in the future.
I like that they offer two sizes of burgers. The "Big boy" regular size and then the "Little size". Three sizes of fries and they offer a great BLT for those that aren't burger crazy. All the toppings are free, load them up !
One more thing that I like about Five Guys, they are open seven days a week. Sometimes on a Sunday it's hard to find something other than fast food open late. The Monroeville location is a nice clean and friendly burger joint.