I like that it's able to import from various formats, such as DXF/DWG files or even 2D drawings! Importing multiple views in one file was nice too but unfortunately not available anymore (as of version 4).
The ability create reusable templates by dragging-and dropping objects into them with drag'n'drop would be really helpful if this feature were added back again at some point - maybe you guys could consider doing so? It does have several features which are rather unique compared other CAD software packages out there; these include an internal drawing viewer where all documents can live together within ONE document window instead using separate windows per different projects / versions etc., along side many more useful "utility" functions i personally use quite often without having much need otherwise than my job duties requires me do :), also being part integrated 3d modeler makes its usage easier then when we used AutoCAD only ;-).