I have two FlashCut systems, both work flawlessly and the support is excellent. I know there are many, many people using Mach3, but I have had nothing but trouble using it. I have tried using the Smoothstepper, different computers, etc. to run Mach3, no luck. Funny thing is FlashCut has run on the computers that I had trouble running Mach3 on. FlashCut is more expensive than Mach3, but in my case it was cheaper to get back to making parts.
Mighty Viper VMC-950, Acromax MX-16, Bridgeport Boss 5, Tongil Panther ST-20, Bridgeport-Romi PowerPath 15, Lagun FTV-2, BobCAD V26,V25, Dolphin V13