So, how's it working out so far?
The only problem I have with it - and this is likely more about the way that Thunderbolt works and less about the dock itself - is that devices plugged into it aren't active until the machine boots fully.
Normally this wouldn't be a problem, but since OS X Yosemite has you login before the system is fully booted, my external keyboard/mouse combo are not active and I have to use the laptop's own trackpad and keyboard.
Otherwise, all other functions are working exactly as expected. The USB3 transfer rates are in-line with what I've seen from other USB3 devices (mind you, my MacBook Pro is the 2011 model that does not have USB3 natively). I have all of my network activity channeled through the dock's own gigabit ethernet, and I have external speakers connected to the audio port. In terms of audio quality, I find it indistinguishable from the native audio on the Mac (though I am no audiophile, to be sure).
One other item to note - because my MBP lives on a Rain Design mStand, It's elevated a few inches above my desk and the bundled Thunderbolt cable was not long enough to comfortably position the dock where I wanted it (behind the stand). It might have been OK beneath the stand, but my desk setup works better with the dock a few inches behind. I ordered the 1M Thunderbolt cable (Apple OEM), and though pricey, it does the trick and gives me a lot more latitude.
The next step is to get a second 23" monitor and connect it via HDMI and run the MBP in clamshell mode continuously. I have been putting this off, to be honest, in light of some of the stories I'm reading about older MBPs and GPU failures. For now, I am content with just the one 23" monitor and the 15" screen. Sorry if that's the portion of the review you were looking forward to hearing about.