I had a set of V-Drums connected to a digital interface via a Snake 164 and there was an quiet, but audible, buzz on the inputs being induced from the long snake run (it was running single-ended signalling). Probably some dim-able lighting noise.
I added the DI800 at the drums end and ran the 8 signals differential and - no more noise!
Very happy :)
The unit has more features than I need really, but I've made use of the phantom power from the digital interface which means I didn't need to wire additional power, and the signal boosts/cuts are handy if we ever move this to a different purpose.