Benchmark headphone amp?

i have a benchmark media systems DAC1 that I am currently not using. It is also said to have a decent headphone amp. I though I might hook it up to my computer at work and invest in a set of headphones for my own little listening island in my sea of work. I have never had a headphone system before. Some headphones (e.g. hifiman) are said to need "hi quality" headphone amps. I was curious if anyone knew how the benchmark unit stacks up as a headphone amp and if it would be sufficient to drive a demanding set of headphones. Thanks in advance