I owned the Benchmark (two of them actually) and found it to be a great DAC. I did find it to be little lean for my tastes, though. The modded DAC-Ah is, IMHO, more musical, for lack of a better word...more pleasing to my ears. The music has more soul.
In fairness, I did not own the two at the same time and I am relying on memory for the comparison. I did own the Benchmark at the same time I owned an EVS Millenium II (one of my favorite DACs) and I felt the same way comparing the Benchmark to the EVS; to my ears and in my system, the EVS was more musical and I sold the Benchmark. I would have liked to A/B the EVS and the modded Lite DAC-Ah. In memory, at least, I think the DAC-Ah would compare well and sound as good if not better. Considering that a new RAM-modded DAC-Ah costs $525 and a used EVS typically sells for around $800, I think the DAC-Ah is a bargain. I am currently using a CAL CL-10 as a transport with the DAC-Ah and the combo sounds just great.