This is my 2nd DR900X-2CH. The first one - front camera overheated (in winter) and the video quality was impacted. This second unit is identical and seems to be working without issue. When the DR900X works, it works well.
I really like the video quality and features of the camera. I like that I can add an LTE module (or future 5G module) for cloud connectivity. The biggest advantage over 900S: the Voltage drop detection. This allows you to hardwire without the need of another device to measure voltage drop. Once the voltage drops to a pre-set, it shuts down, preventing car battery drain. Very helpful in Parking Mode. There is a drawback to this:
The DR900S-2CH is nearly identical in VQ and features, except the voltage drop meter. If upgrading from the DR900S to DR900X (not recommended) and hard-wired, you'll need the new power wiring. The front-rear cable is identical; however, the power is not. The new power accommodates the voltage meter feature.
Overall: very good dashcam for everyday. IMO, this is not a good upgrade to the DR750S/900S. If you're contemplating upgrading from those cameras to the X-series; reconsider. I would only buy this if this is the car's first camera.