Disklavier

Sorry for the repeat post but I only heard from Carol and hoped someone had heard both the Yamaha MSP5's and the Advent AV570's (wedge shaped and discontinued).  Since the Advents are no longer made, there is no way of comparing these myself without buying the Advents used sight unseen.  The used Advents will be much less expensive for the pair but I will pay the extra money if the Yamaha's are much better.  Any DU1A users out there who made this decision?  I would love to hear your thoughts.  Jeff