Excellent stagebox, with small and robust form factor, combo inputs, daisy chainable. Works like a charm with other stageboxes like SD8, or S16. Make sure to upgrade the S16 to the latest firmware, though.
I am missing two things on the SD16 (and the SD8): 48V LEDs on the inputs, and more importantly the metal latches on combo inputs. XLR pull out too easily on stage. An upgrade to full-feature combo sockets with metal latch would be a welcome improvement, even more so since the printed board can accommodate genuine Neutrik combos (exact same pin footprint).