Pros
The people are what makes SpareFoot great. Well, that and Chef Andres and his awesome lunches. I'm not sure which I miss more since I've left -- the people I worked with or those free lunches. Just kidding. The tech stack changed quite a bit over the 3 years that I was there, and that is a good thing. People who complain about such things are people who have only one skill and are afraid to learn new skills. Before SpareFoot, I was working at a cushy job that was not challenging me at all, and I was withering on the vine. SpareFoot helped me grow in many ways. If I were ever moving back to Austin, there's only one place I'd want to work.
Cons
Its downtown. That's what eventually led to my demise. 60-90 min commutes each way during rush hour eventually got to me and and I was lured back to a slower pace of life in the lowcountry. But if you live downtown or within a reasonable commute, then you have literally nothing to complain about. Except for maybe the guy on 7th street killing pigeons with a length of pipe. Or maybe all of the people who keep driving off of the top of parking garages on Brazos St. I'd worry about them.