I used dlease a bit over on Steem, but I haven't used it at all on Hive. Unless you are actively keeping track of your curation rewards and how you vote, the return isn't that great from what I have found. Of course if you are just looking to increase your stake to spread some more love around then it works out great.
It does look like some people make good passive from leasing out their SP/HP, but some may not care who gets it. I will keep control of most of my HP, but I do some free delegations to some new accounts and projects.