I like that they are very attentive to our needs as customers - they will listen to you carefully if there is something that doesn't fit well with your business model.
They also have great follow through after the project is done - it's always good when someone keeps working at improving things until you're fully satisfied! Nothing so far - but since this was my first time using them for an app development, I'm sure I'll be able to find any issues or suggestions once I actually use their services again. We were looking for a mobile application developer who could design us a simple yet user friendly interface which would help our clients understand how we work better.