I only wanted a headphone amplifier, but got so much more.
As a headphone amp, it puts in a very creditable performance at a very reasonable price. I'm using it to drive a pair of AKG K-712 headphones and I'm more than satisfied with the sound.
It also has USB in/out, S/PDIFF in/out, and phono in/out, built into a stylish and rugged metal box. My only slight criticism is that it requires a wall-wart power supply (included) rather than mains power.
Extremely versatile device with great build quality.