I owned a 6 cab and it was a bloody brilliant car - I used it as a daily driver.
A few observations from me:
1 - as in any 4 seater cab, you get lots of wind noise / buffetting unless you install a wind deflector. And then you can't use the rear seats.
2 - But this doesn't matter as the rear seats in the 6 are useless. Impossible to get into and no space for adults (unless the driver is a midget and the passenger is prepared to have their knees up around their ears. And it is a horrible place to be wen the roof is up
3 - was ultra reliable mechanically but I had more than my share of electrical gremlins (cd changer, head up display, adaptive cruise control)
4 - nobody pays any attention to it - which was good for me.
Personally I think you are kidding yourself if you think that the repair bills on a 6 will be any less than on a Maserati if something big goes wrong. That said, servicing and general running costs will be lower.