The one I tried too made pops through my monitors on two occasions : when switching it on or off, or when going from analog to digital inputs (in addition to relay clicks). Not that I particularly cared for that or that it risked damage them (since they have a limiter), but indeed it felt a little unrefined.
I also hated the motorised volume pot, which developed a little play early on, behaves in difficult ways to comprehend, doesn't always turn back on at the volume it was turned off, is noisy, and imprecise for comparative purposes. I think Benchmark should have saved us the trouble and featured a LCD display for digital inputs and the motorised pot for analog inputs only.
I believe the digital only version of the Benchmark DAC2 still features this pot, which is IMHO totally unnecessary.