So far, we absolutely love the 60ST60. Watching the movie last night was like sitting in a movie theater. Oh yes, we turned the volume down to zero and that works great as we use our surround system for all TV watching. But it does limit the usefulness of the Apps as we are not using TV sound, so anything done via the TV itself, like Netflix for example, provides no sound. But why use the crappy TV speakers for anything when we have a great surround system and have both the Apple TV box and the PS3 that both feed directly into our receiver and provide all of the services that the smart TV does. There has been no noticeable loss of sync between speech and lips either.
I ran an optical cable back from the TV to the AVR while I was snaking the HDMI and Power cables. My family likes to use Amazon streaming (we have Prime), and neither our ATV nor our Oppo 93 supports Amazon, so the optical cable solved that problem for us. No way I could live with the TV speakers.
Enjoy your new set.