Fast and efficient drafting, with good object snapping, control over visual output and layout.
Quite complete, including full 3D kernel (Parasolid) and integrated rendering.
More and more supporting BIM workflows, including IFC exchange.
The integrated spreadsheet allows you to measure quantities from drawn elements.
Also supports OSX and fairly cheap when comparing with regular CAD software, such as AutoCAD.
Does many things "differently": layers are classes in VectorWorks and the VW layers are used for something else; 3D was a mixed-bag in the past: entities that were not 3D-compatible, stayed 2D and cluttered the viewport. The strengths of its 2D drafting don't fully carry over into the 3D modelling.
When you still rely on drafting and like to work more like Adobe tools than AutoCAD, VectorWorks will make you feel at home. It has a powerful 3D engine and is supporting BIM more and more, so it does provide a growth path.
Have used it for almost three years full-time, when working in architectural offices.