I got this headphone amp for recording purpose. If someone needs an own monitor mix, I can link this Behringer to the aux send of my mixing console and dial in the sound I need. Independent from the main mix.
The MA400 does its job well, connects to everything I need without problems, has a lot of power, no hum and the amount of hiss is tolerable. No device for hi-fi-gear-heads, but no crap either.
The housing is quite solid, the connectors are not screwed to the box, but rugged enough. You shouldn't step on it or park your car on it, but you neither have to handle it with special care. Also the pots feel solid and reliable.
The MA400 is good value for money. Give it a try!