If you look at Alphalab's FAQ, you'll see that they expect companies to stay in Pittsburgh after the program. This is different from other seed accelerators, and should be a major factor if you're considering it.
Just to clarify what Steve said, if the company actually goes under and you want to move away from Pittsburgh there is nothing wrong with that and you don't owe anyone anything. The terms state a company needs to maintain a presence in Pittsburgh. I don't think this necessarily means your entire team has to pick up and move here, but I would think at least some of your team should be in the area during working hours more often than not. It's not like applying means you have to commit, it's just another option on your plate and you can obviously talk to the Alphalab advisors during later stages of the application process and see if it's something that's right for your company.
I'm an alum. Just to give some background, AlphaLab is funded by the state (indirectly), and so there is that residency requirement. However, if I remember correctly, if you move, you just have to pay back the $25k. You're not permanently stuck.