Been running mine for a couple of weeks, and for 1 week with a CM100LTE attached to it.
I'm very happy with it. Glad to have it in my car. More fond of this than my 900S.
The images seem sharper and clearer compared to the 900S (yes I know the 900S is 4K).
I have no problems connecting to it via wifi, whereas my 900S has always been unreliable in that regard.
Cloud connectivity via the CM100 has been flawless so far.
The hotspot functionality works well too (except when using it with a 900S which I have another thread about).
I may be happy with the 750X+ because the wifi and LTE functionality has been flawless so far. Over the years I've used countless devices with wireless functionality, dashcam and non-dashcam. More often than not the wireless functionality in those miscellaneous products was flaky or sub-par.
As a parting shot, if the 750X+ is a 10/10 then the 900S is 6/10.