I was reading another thread about sanders and saw a brand I was unfamiliar with, Mirka. After a brief check on Amazon I found out the ROS sells for $495.00 (electric). What makes this sander roughly six times better (it is roughly six times the cost of anything else, except Fusstool) than any of the other ROS out there? I have a hard time believing it will sand that much better or last that much longer than my old PC or Bosch.