I found this review unhelpful and contrary to my experience. This part seemed especially objectionable to me:
"The Algorhythm Solo –dB is an IEM users DAC. The single-ended connection pushes out at 1.69v rms. This is slightly quieter than many of the other DACs currently on the market. Paired with either the Intruder or the Rx MkIII-b this is going to reduce unwanted background noise and help deliver a nice black background for IEMs and low impedance headphones. On the flipside, may want to pair the –dB with a powerful headphone amp if you plan on listening though an extremely inefficient full-sized headphone via single ended connections."
While it's true that the -dB has a lowered output compared to the original CLAS, for IEM users the amp still needs to be chosen carefully to avoid hiss or excessive volume at low levels. I don't know what IEMs the reviewer used with the MKIII-b to get "a nice black background," but I definitely don't hear this with the -dB/MKIII-b combo and either my UERM customs or my Senn IE8s. Nor would I say the background is close to black with either of my portable full-size cans (DT1350 and Ed. 8). So it's hard for me to imagine an IEM that wouldn't manifest some hiss with this combo. For IEMs, the -dB/Pico Slim is a better match, and there are probably plenty of other good portable options now like the Leckerton UHA-6s.
And his statement that the -dB needs a powerful amp for full-size headphones implies that the MKIII-b doesn't fit the bill. If anything, I feel the MKIII-b was designed to drive "inefficient" full-size cans like the LCD-2/3 and HE-500/6, rather than IEMs.