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The timing matters a bit here because this is an older-generation portable dongle DAC/amp, but at US$99 it lands well below the US$119 25th percentile and far under the US$376 median, so this is a strong deal on the used market. Against US$699 at the top of the recent comp range, the asking price is comfortably bargain territory rather than merely fair.
What makes it worthwhile is that this type of Questyle unit is usually bought for clean, resolving drive from phones and laptops without much fuss, and the M15i is the kind of compact, premium-feeling piece enthusiasts keep around as a daily-carry DAC. At this price, the main thing I’d want to see is a clean connection, no intermittent USB-C issues, and the key accessories if you need them; otherwise, it’s the sort of grab-and-go buy that makes sense for someone wanting a serious portable step-up without paying anywhere near full-market used money.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Questyle Audio emerged in December 2012 from Shenzhen, China, founded by Jason Wong, an innovator whose university experiments in 2006 sparked the company's signature Current Mode Amplification (CMA) technology. This patented approach, filed globally just 18 months after launch, revolutionized amplifier design by adapting current amplification from high-speed communications to audio, prioritizing lossless, high-fidelity playback. Rooted in China's tech hub and manufactured by Foxconn, Questyle quickly built a global footprint through relentless R&D focused on overcoming environmental and technical barriers to pure sound.
The brand specializes in premium digital-to-analog converters (DACs), headphone amplifiers, and integrated desktop solutions, with standout portable dongles like the M12 and M15 embodying CMA alongside ESS flagship chips for PCM 384kHz/32-bit, DSD256, and MQA decoding. Their lineup emphasizes minimalist elegance, from compact mobile amps to robust desktop DAC/headphone amps like the Q192, delivering effortless, high-resolution performance without gimmicks.
Questyle holds a confident position in the high-end portable and desktop hi-fi market, earning acclaim as a premium challenger to established names through superior build, explosive detail, and V-shaped dynamics. Audiophiles praise its trouble-free excellence and technological edge, cementing its reputation among discerning buyers seeking innovative, no-compromise audio gear.
See all Questyle Audio listings on RADAR.
