RhinoCAM works well for my 4th Axis needs. I have a Tormach 770 and use PathPilot. PathPilot expects G93 for 4th Axis work and MecSoft is working to get it into RhinoCAM 2016. It is not there for the introduction of 2016 but they have shared they are working on it. I use the Expert level in RhinoCAM....lowest level for 4th Axis work. I engrave ball point pens that I make on the Tormach and all works very well for me. I took the Tormach class and saw how SprutCAM works. I wasn't excited. Yes, RhinoCAM is more expensive but as a plug-in for Rhino it gives me editing capabilities I need. Plus, it works like Rhino......I don't have to learn another program.....only toolpath editing and G-Code. For me, learning too many programs is very frustrating. I move into information overload very easy so keeping it simple is best. Some folks have no issue with multiple programs...I do. I have been working on learning Grasshopper. WOW....that is a powerful program and free for Rhino owners. It also runs in Rhino and it also puts me into info overload quite quickly. Hope that helps......