Agreed, today was offered a package for a great price BobCAD with the BobART and 3 axis Mill Pro modules - but after reading here and on the web getting nervous about the purchase. It does appear to be very different from parametric programs and apparently has a steep learning curve - which doesn't intimidate me. The question is - is it a program worth purchasing? It took since last August to get productively familiar with Fusion 360 - with the aid of books and videos. It doesn't appear there is a single book available on Amazon for BobCAD. Would be very reluctant to ask questions about the program here. Also downloaded MOI and it does appear to be quite an easy to use program - however limited.