They have very good customer support that will go above-and beyond for you when needed! I wish they had more features available within their platform but it's pretty much everything we need at this point in time so far as functionality goes (we're doing research).
We use Pmanager primarily because of its ease/reliability across platforms - desktop software vs mobile apps & web browser etc.- which makes us feel like one big happy family regardless if someone has access from home or not while still being able keep up productivity elsewhere too without having all these different devices running concurrently haha :D.