Don't worry about it, they all look quite similar, most are chinese clones of chinese cameras
Actually the A8 camera i have looks almost identical to a camera called the road hawk 720, which costs about £80. I don't know if my A8 is a clone of the road hawk, or if the road hawk is a rebadged A8 camera with "designed in uk" marketing.
The gamins higher price might be a bit inflated due to its name, the chinese brand cameras might not have a well known name but they seem to work fine.
I got the tv to setup the rear A8 camera today, mainly the time and date, as well as checking that it was angled correctly, to do this i have to remove the B pillar trim and hoke out the lead and connect it to the TV (the tv was powered by an extension lead from the house):
I don't want to upload a whole video right now, but here is a few screenshots of the footage i got today, i drove my grampa to ballycastle as he bought himself a yaris to replace the polo.
Is anyone surprised that one of these appeared in the footage:

(this car was sitting behind me in a queue for roadworks, it needs to be this close before the plates can be read)

(a night time shot, a bit crap to be honest)
After watching the footage back i can say: the image quality is not as sharp as the 0801 but thats expected as it only records in 720p that does mean that you can only really see number plates if the car is very close such as queuing at traffic ligths, night time footage isn't great, its ok in well lit up areas such as towns or on roads with street lighting.
It doesn't seem to remember the date or time, thus rendering the whole exercise with the tv a waste of time. But it only cost £20, and it might just see something sometime which could be useful.