I have been working at Springbox full-time (More than a year)
The downtown location, vibrant people, and sweet dogs all make Springbox a great environment to work in. The agency life isn't for everyone, but if you're hungry to learn and do good work, Springbox is a great place to earn your stripes. Management usually does a good job of being transparent and approachable, and I've always felt like my voice is valued and taken seriously. I've had the opportunity to hone my skills on lots of different technologies and been fortunate to work on many projects for household name brands.
Agency life can get hectic, and although it's great to be trusted with responsibility, it can also come with a fair amount of stress. I've definitely had projects with over-demanding expectations in the past. There's an ebb and flow to the workload though and it usually evens out in the long run.
Advice to Management
Continue and encourage transparent communications with the company.
I applied in-person. The process took 1 day. I interviewed at Springbox (Austin, TX) in May 2010.
Great interview with what seems to be a great culture. Seems like a company that's moving in the right directions with capable people running it.