Keling Ac Servo

Has anyone used the AC Brushless Servo Motor and Driver from Keling ? I
want to try one of these out but can't find much information on them.
http://www.kelinginc.net/ACServoMotor.html
<http://www.kelinginc.net/ACServoMotor.html> I've heard ac Servo
Drives need a lot of setting up as opposed to a PID setting on a brush
drive. They say the kit comes with wiring instructions but I'm more
concerned about being able to tune the drive.
Thanks, Glen.



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