I have recently bought an Elna 860 from a vendor at the Paducah show. He promised me all kinds of assistance after purchase, but I have not called in that marker yet. The dealer is over two hours from my home, so it means a road trip for my husband and myself for me to take advantage of those perks. I have just been too busy to take advantage of his good nature.
My suggestion, if you desperately need a machine like the Juki, since this is the one you have mentioned being interested in, find yourself a vintage Singer (I understand the Juki is SS only with various other little add-ons, like needle up/needle down, very strong motor for heavy work, etc., and use it until you can go to a show which will be demonstrating the Juki, (I saw them at Paducah, but didn't check them out), and buy one at the end of the show. This was my salesperson's reason for giving me about a half-price discount on my Elna--he just didn't want to pack up any more than he had to to bring back to Chattanooga.
And I am inclined to agree with the person who said if you are an experienced sewer/sewist, you won't need a lot of the dealer demonstrations and help; you can read your way through a lot of getting acquainted with a new machine. Good luck, and we look forward to hearing what you decide.....