Odd, but the S600 is not listed on the JR web site.
http://www.jrradios.com/Products/Radios-Air.aspx

Must be discontinued

Shows up on HorizonHobby site
http://www.horizonhobby.com/Shop/ByC...dID=JSP16000**

All features of the S400
Digital computer precision
Dual rocker switches
Dual rates
Exponential
10-model memory
Travel adjust
Sub-trim
Flapperon mixing
V-tail mixing
Trainer system

This is a very basic computer radio. Not a lot of mixing offered. I would really like to see a flap/elevator mix for landing and an elevator/flap mix for aerobatics. Note that this price package $159, has standard size servos. Good for 40 glow planes and some 2M sailplanes, but typically too big and heavy for small electrics/parkflyers. Receiver is not too big,however.