#1 Get the specs on these drives to the great techs. at Camsoft. You need a drive that works with a Galil control computer. These generally have quadrature encoders and a 0-10 volt signal to the drive. The P-I-D control is done within the Galil computer, not the drive.
#2 this area is Camsoft's great strength. You'll need a good application progammer, all the tools to do this are there. I would only consider the Pro level control for your needs.
#3 Reliablity (my personal area of expertise) - The components are solid. Good design, careful installation, documentaion, maintanance training, etc. will give you a very reliable machine. The weakest component in the system is the computer: two steps here - have clone of the hard disk ready to boot. I also have a complete spare computer with galil and adlink cards ready to swap.
Karl