Update, for those locals who are interested:
My wife and I stopped by Lynnwood Motoplex yesterday for a chat about this situation. They were very friendly and forthcoming and did not treat us "yesterday's customers, see you later". They put together a signed letter for me with assurances about their continued maintenance support of my Spyder using trained techs and access to all OEM parts, use of the BUDS hookup, etc. While I would certainly prefer that they had stayed as an official BRP dealer, I am satisfied that for the routine maintenance that I paid for under the plan they will be able to properly comply. They are only 10 miles from me and the alternative dealers are all at least an hour away, so that was also a factor in my decision to accept their letter and assurances. I know that if I have anything major that needs doing outside the maintenance I will probably have to go further afield, but I will deal with that when it happens.
They have been pretty good to me in my dealing with them during the time we have had the Spyder, so I am willing to give them the benefit of the doubt that they will continue to step up here, until proven otherwise.
