Yeah, having grown up around one--my Dad bought a '69 Sportsroof new, which I have now, I know those cars well. None of the diecast makers have got that detail correct so far in 1:64th.. M2 is close on their '70, but they got the shape wrong (the front edge doesn't slope forward so much).
Ertl had an intact rear quarter window on theirs; as well as painted undercarriage and engine compartment. One of the better 69-70 Mustang samples. If it had JL's shaker setup it would be near perfect.
I picked one up last Thursday at TRU, and was really disappointed by the misshapen hood scoop. Having been in the Mustang hobby since the 60s, details pop out really quickly, and there's three that violate my eye, after having gotten used to so much more from GL. The rear quarter panel scoop is at least a third longer than it should be, and without the gaping maw; the rear quarter marker light is more than twice too large; and the hood scoop has the correct shape for only the opening... Less obvious are the door handles too high, and the rear quarter window shape being so far off.
I like the overall proportions, but the details on this car did not seem up to the standards I've grown to expect from GL.