I am currently using Vellum Cobalt and am considering switching to Vectorworks. Having been a Mac and Vellum user for over 10 years, I now find the company falling apart again. QC poor, buggy, slow to impliment features and a general direction more towards ID and no improvements in mechanical which I do a lot of. Is there any one that has switched or has used both programs? Also, how does Vectorworks compare to SolidWorks for mechanical design solid modeling? Any comments would be appreciated.