The Flashcut servo system works great and is very easy to setup. I am using a 4-servo motor Flashcut system to drive a Taig mill.
If you are ok with the Sherline lathe's ability to handle your production then the Flashcut control system will work just fine. Remember that the lathe is cheap compared to the Flashcut system. But that same Flashcut system could be used on many other lathes or mills.