These folks have been around for a few months now. When they first shared their link, some issues came up that led me to question things.
First of all, they admitted that much of their material was picked up here for free. Now, they're reposting the same stuff and charging people for it. I have a real problem with that. The law probably would as well if they ever got around to looking into it...seeing as how the bulk of it is copyright protected and not legal to charge for.
Second, they claim to be the largest collection anywhere on the net. That simply isn't true...at least not as of my last check. We do have more here. If they surpass the TMF in the amount, so be it. They haven't done so yet.
The choice of whether or not to join the site rests with each individual. But, I would be very hesitant to pay roughly $20/mo. for what you can get here for free.
Just my two cents.