It only allows for one project to come through from Asana, and all of our tasks have multiple projects, so I had to do some workarounds and deactivate certain projects in Everhour so that the tracking would show up as I needed.
I also was having a hard time getting the reporting to match clients by project. It's not super intuitive.
I think it's one of the best time tracking tools on the market. I prefer it over everything else I've tried so far. If you are working at a desk on a computer and do not need a "time clock," it's great.