I really like FD above all other screenwriting apps, but there are some minor irritations with the mobile version:
1. Limited to US dictionary
2. No watermarking when sharing
3. No link to iCloud
4. Major issues when editing/creating the title page.
Otherwise, the UI is great, easy to understand and a very intuitive design. I have always, and will always use Final Draft.
Eljayrice about Final Draft Mobile