I have a Viking that needed service , and the local dealer was more than happy to do the warrenty work. ( I had moved out of state from where I purchased). I would be very leary of any machine that could not have warrenty work or any repair done by what ever dealer happened to be handy.
My Mom just purchased a top of the line Viking while visiting. The only issue is that she had to pay $75.00 total for three lessons when she got home to her local dealer. For what she saved it was well worth it.