These are some of the most refined works of automotive engineering on the road today, which is both a good and a bad thing. They are designed more for aesthetics than durability, but the components used are of the highest quality with components sourced from BMW, so they are as reliable as we have come to expect from the German automaker. Additionally, each hand-built car must pass stringent checks before being delivered to its new owner, so while there are no specific reliability ratings to reference, this prestigious brand is unlikely to deliver a dud.