I'm on it but was never awarded any invites to hand out.
The reason I don't use it much is because of the high standards they have for what you can share. Files have to be encoded a certain way, using specific software, etc. Quality control, which is good for the content, but can be a pita if you're not already ripping your music this way.
I guess other invite-only sites probably have the same kind of rules, I don't know. This is the only one I've ever been on.
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