Seems like Midland did a post and run and hasn't come back to answer any questions, which is a shame.
A friend saw these on the REI website and asked me about using one in his van, which is why I had the questions about them. Reading the FAQ on their website, it would take 48-72 hours (!!!!) to recharge with solar, too long to recharge from vehicle 12V and 17 hours to recharge it using the supplied AC adapter. So really this thing is only useful for weekend warriors who would charge it at home during the week, run it down over the weekend and then take it back home to charge. There is no practical way to recharge it while away from mains power. It is a bit disappointing that the Expo review didn't make this clear as this is pretty much a show stopper for most of the users here. Maybe Midland can correct me if I am wrong.