That's my opinion too - I'm not sure why K2 feel I'd be safer with Mach2. As long as most of the bugs are worked out of version 3 I'm more than happy to commit to that.
Can you tell me if I can run my CNC router on Mach3 alone or do I need an expensive CAD/CAM package too? I used to be a machinist and spent many years programming CNC machine tools using Fanuc controls and writing machine code straight off the top of my head. There were no real CAD or CAM programs out there at the time. Looks to me like Mach3 can do most of what I will need (I make guitars).
What if I needed to profile a convex guitar top with intersecting compound radii? Is that Mach3 and beyond?