There are 3 miners, wolf's, claymore's and yam. Yam is going to release update soon.
I have no idea about that miner but I do know that I wouldn't trust a Newbie to point me to download anything. Beware.
I am also using that miner for a while now, didn't see any problems. Fee is even less than Claymore's miner.
Everyone can make his or her own risk assessment, but if I were downloading a binary (at least I assume it is a binary) from some unknown source I would at a minimum only do it on a computer without any data I care about, and definitely no wallets (XMR or otherwise).
It might be just fine, or it might not. Pretty hard to tell.
Good point, though i am using it on my rigs that hold no data whatsoever, so yeah, people should stick with known stuff on private computers.