I really love SP too, which I'm on as I write this. I pretty much use it on desktop and Partiko on mobile. Except that when on desktop, if I post using Busy I get about .40 as an upvote from them, so I tend to post with Busy and read with SP. Hopefully they can get a delegation at some point and be able to also give upvotes to platform users. (Maybe they can get the old dLive one.)
I had read about Busy but never tried it. I wonder how the upvote works as $0.40 is not bad just for using the site. Does it take a part of the reward (beneficiary)? I will definitely put on my to research list which is getting long with all the Dapps coming on board the Steem ecosystem!
The upvote amount is based on how many active followers you have. I don't think they take any beneficiary. At least I haven't noticed if they do.