Good feature for wedding DJs they’re just playing songs. Also, good for beginners to learn what to do.
Not for professional DJs who actually mix and play public gigs for a few reasons.
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Lack of fidelity - pros and audiophiles only play lossless files (or at least 320)
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Latency is not your friend when you’re mixing music.
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Internet is unreliable. Lost connection = lost collection
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As a professional, you make money doing what you do and it’s best to give back to the artists that give you fire tracks. You buy their music-they keep making it. It’s a good way to support the electronic music community.
 
Cool tech. I wouldn’t use it, but I see a purpose for it.
Doesn’t hurt me or help me.
Also, If pros start using it out they’ll end up sounding the same from using the same library. DJs with unique collections will stand out all the more.