I've used Camtasia mac trial version for few weeks and it's absolutely what I'm looking for. It's really amazing and I can't even imagine comparing it with other similar tools out there.
The one and only problem which I encountered is the huge size of recorded videos and lack of time and free space on my SSD to reduce the size via encoding (=share) section. In my opinion, it would be so great to be able to set the desired bitrate at the first before starting to record.
So please let me know the possibility of adding this feature to the app in the next updates by the developing team.