The reason I love turntable is that there's constantly new music, and it's curated for me. I mostly absorb, but I can contribute when I want to. The barrier is that I don't have much good music on my hard drive and turntable's catalog often doesn't have what I'm looking for.
The reason I love youtube is that the music collection is nearly unlimited, but I often find myself listening to songs on repeat because I'm too busy/lazy to curate a list of my own.
Plug.dj merges the best of both. And it looks nice too. I'm excited.
Youtube has (almost) everything.
Soundcloud enables you to use the music of small, unknown Artist that often rock hard, or mashup artist and eclusive previews you don't find on youtube.
And if you want to show off your own stuff, just upload it on soundcloud and add it to your playlist.
So i guess by not having to upload it yourself, but using what you just found on youtube or soundcloud plug.dj is even better for discovering new music, + its easier to handle.
I'm diggin it.