Many thanks to Ayako for tweeting the link!
Sound Mixer Danny Micahels talks about the sound device and the cart that he redesigned for it that he used for several films that he worked on including John Wick in Creative Cow. He said the following about John Wick:
Michael used this same cart for John Wick and Non-Stop. As John Wick was action-oriented, with a lot of gun fights and quick movement, it required a lot of sound effects. It also employed a file-based workflow. Sound Devices ability to seamlessly swap out removable storage was a huge asset onset, as Michael simply supplied his CompactFlash cards to Light Iron, a post-production company specializing in on-site dailies, digital intermediate, archival and data services for projects originated on file-based motion cameras, for them to process the dailies on set.
You can read the entire article here.