I've used the One X2 for about a month after owning the One X for over a year. The X2 is far better.
I had big problems with the X, especially with its vibration sensitivity from where it is mounted on the S1000RR triple-clamp. The X crashed frequently - not only stopping the current video, but corrupting it - and the frequency/severity of the crashes increased with time. I sent it back for RMA twice, and each time it returned better but then resumed its downward spiral to uselessness.
Despite my unhappiness with Insta360, I recognized they were still the best of class and thought I would give the X2 a try after assurances that it was designed to be more resilient to vibration. I needed something for track days, among other things, and helmet/chin cams are disallowed by many racing/track orgs even with a tether.
Overall, I find the X2 way better. Here are some high points:
- Vibration resiliency has been perfect thus far. No crashes.
- The level-horizon control works really well and I prefer it to the camera framing that rotates with the motorcycle lean.
- Flowstate Stabilization is excellent.
- h.265 encoding is nice for smaller files, especially if you have a powerful PC for editing.
- The battery life is way better, though I mostly don't care because I keep it continuously powered via USB.
- Not that it matters much, the native audio isn't terrible. Even with no dead-cat or other wind muffling, it's not totally useless, though the AGC intervention becomes obvious.
There are some negatives including:
- The USB connector is in a poor place and oriented the wrong way, both of which put the cable in the frame. It would be better had the connector been at the bottom of the camera away from the lenses where it wouldn't interfere with any of the important frames/views. The USB-C should also be aligned with the length of the camera, not crossways/transverse. This causes my right-angle USB cable to come into some frames whereas it would be invisible were it transverse.
- I would prefer it to have a GoPro-type mount instead of the cold-shoe camera shoe.
- Despite being released for about three months, batteries are not available anywhere, including from Insta360.
- I don't like many aspects of the phone app, the Insta360 Studio desktop program, and its reliance on the GoPro FX Reframe plug-in for Premiere Pro, but I'll save that for another time.