First, this is my favorite place to get any kind of espresso drink in the entirety of any coffee shop I have ever been to, ever. I also love the authenticity of the coffee shop.
However, due to the popularity, I usually feel rushed in and out and it can be pretty crowded. I don't mind having to stand and drink my coffee but sometimes there isn't even any room to stand. Also, the parking can be hit or miss depending on when you go, but that's not their fault.
That being said; anything negative is worth it because it is literally the best espresso in my favorite place in Pittsburgh (the strip district).