Chris,
I tried TurboCAD Mac Deluxe 8 for a while, but I found it very frustrating to use. The toolbars differ from the Windows version and some functionality is not available. This makes following the video tutorials somewhat difficult. I paid real money for it, so I was not too happy.
Next step was to try the free version of Autodesk's FUSION 360 for the Mac. What a revelation! With no prior experience with the software, I drew up a crankshaft for the engine that I am designing in a few hours. The same part in TurboCAD had taken several days and was still not right.
I have not tried the 2D aspects of either package as I have little use at the mo.
Hope this helps
Dave