i am the customer and i am used to FULL HD in this day and age. if i am serious about getting the best bang for the buck i will pay for it.
these manufacturers can cut costs elsewhere: make a cam system with no built in screen if that cost can be put into making the front and rear cam full HD. there are ways to compromise.
X2 is close enough to release that the filler product wouldn't arrive in time anyway..
X2 image quality is excellent, the new sensor does a fantastic job
reach out to the developer of the cam, or search the internet. since cabbies use it, there is obviously night footage online. more than likely its going to be the same quality as cams with similar image sensors.
also you want to look at customer service after the sale. its an Israeli company right? are you willing to ship it back there should you have issues with it?