Isnt the demo of Meshcam fully functional? I downloaded it but didnt have the chance to investigate it too in depth.

For any serious CAD I use serious CAD software like ProE. Then again, I don't use CAM to just do the 3D models, I need them for FEA or getting professional level engineering drawings. If you just need the basic stuff, have a go at Autodesk Fusion 360. I have been using that for CAM as it has some nice 3D CAM functionality and is very similar to Inverntor and HSM

I can see the attraction of the Art side of mesh cam though.