Works well for working while mobile
Despite the occasional crash when generating a PDF, the app does what it advertises. It works well as an app where changes and additions to a document can be made while away from a desktop install of TeX. The only real negative I see is navigating through a file and trying to insert text within a particular line. That could take several tries and becomes annoying when in a hurry.
Only minor issues about
TeX Writer - LaTeX On The Go