Well you've hit the nail on the head (LTN - BGR) clearing customs twice in the 680 I would imagine is a PITA....
Comparing the C750 and the chally is a little unfair, different philosophys, people buy the Ten for one reason only.
Having said all that the Sovereign is a very endearing aircraft, excellent low speed handling (which IMHO is more important than 45degree fun at FL4XX), very capable autopilot. Its party trick is mixing it at 125knts downwind with Cessnas and pipers into the much nearer 1100m field with enough fuel to get out again and get somewhere useful, where heavier iron is bugging out further afield.
Its also as easy to operate as a Bravo (Thank god!)
That 300 is a handsome bugger though (again)
