This is a really neat module for a small, self-contained rack. It gives you useful line outs as well as a safe headphone out, and connects behinds the scenes with the Intellijel Mix-Up, so you can bring a bunch of sources together. It can make life a lot easier.
However, the tiny headamp is somewhat lacking- while it can go nice and loud, it doesn't exert terribly good driver control, even on relatively easy to drive dynamic headphones. Even something like the bog standard Sennheiser HD-25 70 Ohm can sound flat and lifeless- not sure if it's lack of slew or current, but don't make any critical mix decisions on the basis of the tiny headamp in here- run the outs into your desk/sound interface and use something with a better headamp. It's not terribly linear or detailed.
Don't let that put you off though, if the combo of this and the Mix-Up suit your needs. It's a lot of functionality for the HP and can make a useful combo. If you don't need the Mix-Up connection though, I'd seriously consider the Befaco Out v3, which is smaller, and which has a slightly better headphone out.
One note, I did experience a lot of crackling via the headphone out at first- this was improved with a few blasts of air duster and a tiny bit of switch cleaner- maybe the connectors were slightly tarnished. Worth a try if this happens to you.