The simplicity of the entire tool and being able to easily trace defects right through to requirements.
Also the easy handy reporting functions are great.
At this stage there is nothing I truly dislike.
Perhaps my limited knowledge of how to hook together with automated testing
I would recommend qTest to others who are looking to become more detailed with testing activities. Its also great to have everything within the one place from start to finish and with great integration available I think this is one of the better value products out there.
Traceability of tests and defects to requirements.
Clearer visibility to testing results