Gecko servo drives

How reliable are the Gecko servo drives G320/G340? I'm looking to
convert my stepper controlled router to servo control. I'm currently
using Mach3 and I'm looking into the 4-axis control package from
www.camtronics-cnc.com. Any and all feedback on your experience with
implementation of this control system and drives would be greatly
appreciated. I don't want to jump into a system that has a lot of
issues and/or bugs to iron out. Just want to have a more precise and
reliable system for making parts. At a reasonable cost of course.