Just received my V1 back the other day from calibration/repair at VR. Glad to have it back. It seems to work even better now than I can ever remember. Its a v.3.619 and I did NOT do the upgrade. It seems more sensitive on X and K as I'm getting alerts in areas that haven't given strong if any signals in the past (door openers, motion detectors etc.). And in these areas, nothing has changed. The real test came the other day when I got a Ka alert almost a mile in advance. He was around a long sweeping curve and down a hill. Picking off cars with IO, but I was still warned WAY ahead of time.
VR did not charge me for the repair and sent it back 2nd day air, also no charge. They really stand behind their product.