I haven't tried the cooperative masternodes, however I have mined with CryptoHub before. They sent my mined assets to my external wallets just fine, in the time they promised. So I have no reason not to trust them. I imagine the cooperative node works like this - you send your assets to CryptoHub, so do the other n number of people, they set up the node for you, lock those assets and set up the node. They keep part of the proceeds to themselves, and send the other ones out in proportion to the % of the node you own.