Review (5/5): Works well, once you figure out what signals are actually available
The TVLInk II is a great solution for those of us with Phonak hearing aids (and their associated ComLink), so that we can comfortably hear TV audio without cranking up the speaker volume to levels that other listeners would find uncomfortable. I haven't noticed any synchronization issues.
My problem was figuring out how to get the correct inputs into the TVLink from my sources (satellite TV and Blu-Ray/online sources like Netflix, connected through a Denon 1909 AVR). My Panasonic plasma TV only has audio out via optical SPDIF, which would seem to be perfect with that input on the TVLink II, but after considerable experimentation, I found the TV output was only active when I disabled my Denon system and its HDMI connections (but at least I knew that the optical side of the TVLink worked OK). But the other listeners wanted nice audio, too! I was never able to figure out how to enable the optical output from my Denon 1909 AVR (worst user's manual ever) as the source for the TVLink.
After lots of experimentation, the solution was using two inputs to the TVLink: the optical output from my satellite box decoded with a Panlong Digital Decoder, output to the TVLink with a stereo cable; and digital coax output from my Blu-Ray/Netflix player directly into the TVLink. It does a good job of auto-switching between those sources.
An interesting little advantage of this setup - when everybody goes to bed but I'm still watching TV, I simply mute the Denon output to the speakers but I still receive audio into my hearing aids. Lots more comfortable and better audio quality than the wireless headphones plugged into the Denon headphone jack.