The Ketron service I have experienced is WAY WAY better than the way Korg treated me!
Nothing ever went wrong with my Audya, or my SD5, or SD1 or Midjay or X1. However when my Audya was first shipped it was damaged. They shipped another one and told me to send the first one to AJ, at their expense.
Having said this, I always have a backup in place for every piece of gear I use, including arrangers.
DonM