Not many comments about a mid-engine configuration taking away from the already limited baggage space. In my Vintage, with the top up for highway travel I have a generous amount of baggage space behind the seats and can get two mid-sized rolling suitcases plus again as much stuff here and there but with the SAS cars and other similar ones I've seen, all that space is used for the engine with precious little baggage space where the engine "used to be". Of course the front baggage space is the same for either configuration.
For my long range travel---mostly straight down the interstates, a mid-engine seems to be a big negative. My car does fine at the speeds I enjoy in the mountain twisties such as the Tail of the Dragon and I don't plan to track i, so mid engine doesn't seem to offer any plusses for the way I use my VS.
Plus, what Wolfgang posted above about servicing a mid engine.