I have used a HiFace with a 7520 fitted with a Wolfson Dac and a Gator Board for a while and have had no problems at all, sounds really good to me. (A friend uses the HiFace into a Gatored Caiman, again no problems)
Just got the V-Link (sorry Mark) and it certainly works into the Beresford. (Not had it long enough to do direct comparisons for quality)
A benefit of both is that they auto switch sampling rates to match the file.
The V-Link will down sample 192 kHz to 96kHz, so they play on the Beresford. (The HiFace will pass through 192 kHz recordings which the DAC can't play). If you plan on getting 192kHz music and a new DAC then go for the HiFace.
The V-Link also works with Linux but I have not yet managed to fix the computer so that it won't resample all the audio to 44.1.
Main: LP12, Akurate DSM, Akudorik Speakers
Computer Room: Squeezebox Touch, Caiman SEG with Dorado, LK100, Radius90, XLS200.
Living room: PC with Audioquest Dragonfly, Pi DAC, Sky Q, IncaTech Claymore, Kans.