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If you plan on traveling going off the SC grid then I think the dual chargers and picking up a CHAdeMO adapter are essential. But for most people, I think the dc is not a necessity. Anecdotally speaking, it seems like only about 1/3 of the CPOs I would strongly consider have dual chargers. Makes sense because the average driver only needs long range five days a year, and SC coverage has grown significantly in the last 18 months.