The work can be interesting and challenging but it also depends a lot on contracts. At this time government work is slow in coming so there is a lot of down time or work just fixing bugs which for most developers isn't super exciting or challenging. The company is also currently unstable due to the government slowdown in turning on work so there have been a lot of layoffs.
If you are seeking stability this is not the company for you at this time. Maybe in a few years when things get better. If you want to climb the ladder, this is also not the place unless you are starting at the very bottom - that is if you are more senior then advancement is difficult right now because of the elimination of so many positions and shrinking work force. If you are freshly out of college this is a good place to get some experience because most of the above probably won't matter as much - getting experience is more important.
Having said all that, Overwatch in Austin is owned by Textron which is a big corporation so if you are willing to relocate then there probably are more opportunities including advancement.
When things turn around for this company and they start growing and hiring more, it will probably be a decent place to work. Note it does not have many social activities that a lot of other companies tend to have. It is not cool hip and happening but it is decent work and the people there are really nice to work with.
