While not allowed, it works, and no one has reported any negative consequences when transferring to another person's airline, hotel or Amtrak account. Negative consequences have been reported when transferring to another person's Ultimate Rewards account, and that is discussed in another thread.
I believe CherylD is asking if anyone has recent experiences to confirm that there is still no consequence.
Do you have the link to that other thread where's its discussed about UR to UR transfers?