I've been on steemit for a year and a half now, and I haven't used any of the other interfaces for posting. The reason I haven't is that I haven't felt a need to post from another interface. I've heard different snippets of how they are better for doing some things, but none of it's really much of a drawing factor to me.

I guess the main reason I don't use them is, I don't feel comfortable anytime I have to use my passwords on a third party app or site, which essentially gives them power to control if they'd choose to. I don't think they do what they do for nothing.