I agree with most posters that the dealer is trying to sell you her thread, and with Scissor Queen that you could be sorry in the long run - especially if you are not diligent and thorough in cleaning your machine. That thread throws a LOT of lint.
As for the size/shape of the spool and the spindle - those things can be easily fixed a number of different ways. I would not refuse to use a thread because the spool didn't fit my machine - I'd find a a spindle that DID work with the thread and the machine.