In steembottracker there is a tool delegation and if you enter powernap you see where that account delegates to. They are 5 bots. I think of Dtube but cannot find info yet. The bot tipu makes posts where he compares ROI per bot and after a month I can say he is pretty accurate. I do get rewards each two hours, each day or once a week depening on the bot (see wallet of powernap). As powernap had some large SP for a minute I gave away large upvotes to SSG and ten others. So it is not comparable to the delegation to SSG. The powernap is called passive income (no need to post but lesser ROI).