Well, the good news.  I like the cars.
Bad news.  Though minor, both cars look identical, different paint and decal schemes, but the bodies are the same, even though one is marked as a Dodge, and the other a Chevrolet.
The major dissappointment however, was that they would not run on my Ninco track.  Which, I have pretty much decided to replace with something else, maybe Scalextric.  One problem is the slot width.  Even after dremeling out the width of my track slots some time ago, I still had to file down the guides on the Carrera Go cars.  And then, because Ninco rails are just above the track surface, and Ninco is so soft of a plastic, it rarely lays completely flat, the cars high centered on the rails in the turns!  After over an hour of trying to fuss with the cars to get them to run, I gave up.  Gave up on Ninco track anyway.  
Hopefully in a short while, with a new track, I can report again what I think of the cars.
						Finishing second, isn't much better than finishing at all........  (I believe a David Pearson quote)