We use this app in our organization of approx 100 people. I also know of another organization in our town that uses it, and they have approximately 5 staff. It is very useful to keep tabs on tasks that you may forget about. It is easy to communicate through, and answer via email etc. The company is very responsive and constantly updating their app. Price when you start going up starts to get pricey, so hopefully they will get into a Tier based pricing.
Tazzimat about Asana: Where work connects, v4.11