I was treated to seeing this as an early birthday present. The recreation of the cars and the Le Mans pits is impressive, it's just a pity what they did with them. If Miles (or anybody else) had driven a mid sixties endurance racer in the manner shown he would have been out in the first hour, and who knew that these cars were as fast as current F1 cars. The racing scenes are ridiculous (Miles winning Daytona '66 on the last corner of the last lap, barging other cars off the track at Le Mans and slamming into straw bales without getting a scratch on the car) and the historical inaccuracies pile on each other. We have Miles listening to the 1965 Le Mans race on a radio in the workshop in California having been banned by Ford from driving, when in reality he was driving one of the two 7 litre Fords in the race. Enzo Ferrari is shown attending the 1966 Le Mans race when he famously didn't go to any races. The Ford and Ferrari pits are next to each other when in reality they were far apart, the pits at Le Mans being allocated in car number order, so the Fords running numbers 1 to 8 were at the start of the pit lane, while Ferrari, with numbers in the twenties, were much further down. Ford trying to arrange a dead heat between all three cars when in reality the third car was over a hundred miles behind and played no part in the dead heat saga. The whole thing is designed to give the impression that Shelby and Miles were almost totally responsible for the success of the programme to the exclusion of everybody else, and that Miles was the fastest driver in the team (he wasn't, Phil Hill set the lap record in 1965 and Dan Gurney in 1966). Having said that the recreation of the cars was good, it is regrettable that they tried to pass off a dressed up GT40 as the J-car/Mk.IV at the end.
As is usually the case with any film "based on a true story", the truth comes a poor second to what is sometimes described as "artistic licence".