I enjoy the ease of using Final Draft, in where its connected to my desktop, iPad, and iPhone. There was a recent update where Im finding it more difficult for all of my devices to sync together. Also, it seems like the copy/paste function isnt working properly on the iPad. For some reason, the pop-up to copy/paste doesnt show anymore, so I have to rely on my iPhone and/or desktop to move scenes around.
S. Carmack about Final Draft Mobile