Well, the Behringer still is not that great. Yes, they have found a way to make even a headphone amp not sound very good.
That being said, I have a couple of them. They are inexpensive, feature packed, and drive pretty loud. I had a few of the older models blow channels, but the newer ones have held up for me now for 5 years or so. They sound very harsh, the highs distort pretty easily and the lows always sound rumbly and loose. But, they go loud which is what alot of my clients use. I DEFINATELY would not attempt to do any mixing on headphones through the Behringer headphone amp. What you hear is NOT what you are feeding it. Then again, I would not reccomend mixing on headphones anyhow.