It might be worth mentioning that the speed sensors ARE interchangable. The S-series speed sensor works with the CS computers, and the CS-series speed sensor works with the S-series HRMs. At least the do on my bike. I have a S625X and a CS100. I tried both speed sensors, both worked, and decided to go with the S-series speed sensor because of the interchangable battery.
I’m not sure what you mean by “All of these can use the a none WIND WEAR LINK”, and “CS units can all use a none WIND Wear Link”. I think you meant they all cannot use the WearLink W.I.N.D. transmitter, except the CS600 and RS800 which can only use the W.I.N.D. transmitter. Can you clarify?
Thanks!