Summary: Bought radio in August 2012 and had it installed during winter storage. Come spring, radio worked 5 times we used boat. In August 2013 radio failed. Head had no display. Waited hours on hold for tech support.
Summary: Replaced 3 times; Changes source by itself; Won't recognize ipod. Sony customer service worthless! NEVER AGAIN SONY!! I expected a better product and customer service from you! Clarion, Alpine, or Kenwood all the way from now on!!!
Conclusion: Replaced an older Sony unit -- Fit into current rough-in flawlessly. Manual is good. Unit works as advertised and has performed flawlessly. I like the various sound profiles and adjustability if I want to "customize" the sound output. The amp seems to drive two sets of speakers at volumes that I'd never challenge.
Conclusion: Before purchasing this receiver, I researched many other products. This one appeared to have the most features while providing the best user interface. After using the M60Ui for several months, I can confirm both are true. My favorite feature is the ability to plug in a standard USB flash drive to the rear USB interface and play mp3's directly from the drive.