Unfortunately, my Orion II has developed several problems; the master TCXO wants to wander outside its calibration range and there have been several instances where intermittent issues have shown up in the baseband processors. I am going to miss this radio that has served me well for 12 years.
The new K3S is just an updated version of the K3 which is already present. Some differences in VFO phase noise, less distorted audio, etc. are in the new K3S design.