Over the weekend while Defender was having there annual warehouse sale I called and ordered a MX-5 wheel autopilot now I'm aware that this is still not in stock so for the 75 dollar difference between the older S1 I figured I can always tell Defender that I'm not waiting any more if Raymarine drags out shipping these units to send me the older S1.Today I called Raymarine and was told June before they ship and I'm thinkingthat the only difference I see is the S1 has a rudder reference (that looks like APITA to install) but the X5 has a gyro built in and no rudder reference.So any one have any input on the difference between the older and the newshould I wait for the newer one or get the older S1 and regret laterI value any and all opinions