FLAC is not a popular as other audio formats, such as MP3, however, most modern audio devices support this format. Because FLAC is not considered a standard, potential customers will want to ensure the device is compatible with this audio format. Most audio playback devices offer enough storage space to easily fit FLAC-encoded audio files, so sacrificing sound quality should not be a concern.
Most operating systems support FLAC format by default. It is an open, royalty-free licensing format after all, and detailed implementation documentation is available freely on developer’s website. Older machines may require installation of dedicated codec packs, most of which are available to download for free.
Of course, to enjoy the sound quality offered by FLAC appropriate audio equipment system is required. Cheap speakers won’t magically produce better sound just because they output a high-quality FLAC audio signal.