Responding to the motion detect questions:
I have the Panorama2 and it works great in motion detect. Jon reports the X1 FW will be similar behavior.
I have both motion detect and the G sensor set on. The cam is powered on all of the time, direct wired. While parked, it captures any new motion starting with the pre-buffered 5 seconds, and continuing to complete that file segment. After no new motion, then it returns to monitor mode waiting for the next motion to trigger recording another segment. It will overwrite the oldest segment as needed when the memory is full. My advice is to buy a large capacity memory card. My 64GB card holds 1 1/2 to 2 days recording time. This is acceptable, but I will buy a larger card next time. I drive to work about 6:45 in the morning, park at work till about 5 or 6:00, and arrive home 6-7:00. Often have to drive some more in the evening. The work parking lot is very busy, so the dash cam is busy recording nearly all day (about 80% of the time while parked at work). It captures anything moving. People, cars, trees in the wind, rain on the windshield. While driving during the night, there is always enough motion to keep it recording. It stops after I park at home in the garage. The G sensor locks current file segment if it detects some impact, whether you are driving or parked. A jar from a pothole bump triggers the G sensor to lock that file. I am very happy with how well this works. I leave it in motion detect mode all the time. If I have not driven the car for 2-3 days, the car still starts fine. Very low current draw. About the same draw as my car alarm uses. It helps the memory card if you reformat it occasionally. Clears the few locked files. My understanding is the X1 will behave the same. The bonus is the X1 lens is not such a wide angle view, so the license plates are easier to read, cars appear at a normal distance away, and the lens housing is so much smaller (discrete). Makes a very good cam even better.
Looking forward to buying pair of X1 for my wife's car, and the A7 rearview mirror dual channel DVR for my son's car.