The Malekko Echo 600 Dark includes internal Gain and feedback trimmers, allowing for louder-than-unity repeats and customizable maximum feedback levels.

The Echo 600 Dark features an expression control for feedback or delay time, offering dynamic playability not found in similar models like the Carbon Copy.

The robot graphic on the Echo 600 Dark lights up when activated, adding a unique visual element to its use.

The Malekko Echo 600 Dark is valued for its ambient delay capabilities, distinct from the standard delay sounds of the 300/600 bright versions.

The Echo 600 Dark is praised for having no hiss or noise on repeats, unlike the EKKO 616, which some recall as being noisier.

Compared to the Carbon Copy, the Echo 600 Dark offers less pronounced wet signals and a more fluid, slightly brighter sound, making it preferable for lead guitar applications.

The Echo 600 Dark and Carbon Copy oscillate differently; the Echo 600 Dark is dark and consistent, while the Carbon Copy has bright, sharp peaks.

The Skreddy Echo is often compared to the Malekko Echo 600 Dark, with both having a "magic" element for ambient soundscapes.

Owners have considered external modulation options, like the Toneczar Angel Baby, due to the absence of built-in modulation in the Echo 600 Dark.

Original knobs are difficult to source, prompting some owners to improvise with similar replacements.

Some owners regret selling their Echo 600 Dark, appreciating its unique sound quality in hindsight.

Owners appreciate the Echo 600 Dark for its atmospheric qualities, favoring it for ambient music despite its lack of modulation.

The Echo 600 Dark excels when used with a Wah pedal, offering an exceptional lead sound, unlike the more percussive focus of the Carbon Copy.

The Echo 600 Dark, along with pedals like the Skreddy Echo, are preferred for "washy" ambient tones, distinct from the more straightforward delays of other models.