I like it a lot. For the size and (relatively low) price, it performs quite admirably.
My current reference is a custom all-in-one unit using the Purifi amp modules (this is a new company started by the gent who created the Hypex and NCore designs). The manufacturer of this custom unit - Mivera Audio - puts his own input buffers in front of the Purifi modules, and then adds a DAC and a lightning dock. It uses an iPhone as a streamer/Roon endpoint, and has some of the best sound I've heard; the transparency is eerie at times.
The Brooklyn amp gets me a pretty high % of that sound, actually excavating deeper in the bass. Compared to the Mivera, the transparency is a bit less, resulting in a slightly larger/bit more diffuse sound - the Mivera is just SO precise in image and instrument placement. But this is a pretty close second place to that. I also need to do some comparisons to a heavily-modded EVS dual-mono ICE-Edge amp, which is also right up there based on memory.
Tonally, no complaints, it seems very well-balanced. The deep bass is not overdone, so it doesn't take over. And the highs seem very extended and smooth without any glare (caveat: my age is getting up there, and my hearing above ~16kHz has been degrading over time).
So overall a very nice amp, really love the small form factor and how much is there for the size and price.