The coolest thing about the T-amp, other than the price, is something I didn't anticipate at all. In my home office, where I spend way too much time in front of the computer, it's incredibly handy to have the amp and its volume control right there on the desk just in front of the hand that's on the mouse. I'm constantly making adjustments to the volume depending on the source or whether I have to answer a phone call and moving my hand just a couple of inches forward to do that is way easier than fiddling with software controls or even picking up a remote.
I put the T-amp board in a case with a decent potentiometer, output jack and speaker terminals. Driving a very small pair of Acoustic Energy 301 speakers mounted at ear level on the back corners of my desk has most of the advantages of headphones without the isolation. I enjoy the setup a lot.