I've heard of it but never used it. In fact I don't think I know anyone that's ever used it (my group of friends are pretty much the same as me, old school internet pirates sailing on the good ship Torrent (she will never sink as long as we keep her afloat )).
I'm not surprised by it though. Crunchyroll was the same exact way for anime before they went completely legit (well legit but still shady as hell), I used to use them back then when I couldn't find fansubs for something I wanted to watch (it's how I first got into watching Naruto Shippuden, how I first watched Macross 7, and what introduced me to one of my all time favorites Dirty Pair). They offered a HQ stream if you paid a monthly fee but the LQ stuff was still watchable (sadly I paid for the HQ stream back when they weren't legit but I refuse to pay for it now that its legit, there's something fundamentally wrong with that). I honestly wouldn't know if I'd trust this app though, the amount of shit that could go wrong aren't worth the free aspect to it (then again it'd be no worse then dling a torrent off of a shady torrent site).