Yes I use Zappl regularly.
The one drawback is that it appears on your steemit blog, which is not a problem if it is used judiciously. However, for full blown zapping like people do on Twitter, it isnt there as of yet.
It is a handy app...sends out up to 240 characters....there use to be a limit on sending out once every 5 minutes...I dont know if that was lifted or not.
I believe that started in October so it is still a relatively new application and like D.Tube, makes strides with each update.
Thanks. I appreciate the insights. I'm looking to find ways to remove rewards from companies that are in opposition to my values. I don't use twitter heavily, so I expect such a transition might be easier for someone like me.