Positive - Doesn't wear out the charging ports. Ordered first time from Amazon & got a real tracking number & it arrived quickly. Negative - The cords & plugs for the PRO & standard version are not interchangeable. Would be nice if could charge with either cord/plug. Placed 2nd order from Statik website during Thanksgiving & still waiting for them to arrive on Valentine's Day. I received a Chinese tracking number that doesn't update. After multiple emails with customer service, they agreed to try a second shipment. Received another Chinese tracking number & have no clue if/when it will arrive. And no more updates from first attempted shipment.