Sound On Sound editor Matt Houghton finds "operating this neat little plug‑in really is effortless. SweetEQ’s handful of controls deliver the goods quickly and super‑intuitively; I very quickly obtained pleasing results on a huge range of material, from individual kicks and snares, through vocals, guitars and loops, right up to complex stereo material. The effect can be radical reshaping or subtle sweetening. I often found as little as 5 percent on a slider was enough to do w

Thorough review with great audio examples:

Informative reel why headphones matter during mixing, featuring the Hi-X20 by Austrian Audio

Really great review with lots of convincing audio examples at Amazona.de :

The choice of a song that starts talking about colors is perfect and a nice wink to the interface. The examples on this song are excellent: they are plainly audible on a laptop speakers and a phone while also being tasteful and subtle enough that they are potential for decisions in a real mix.