I am a math student, and its so exciting that I can finally type/compile/sync my TeX files all on the iPad! Works super well with Dropbox, compiles well, never had any problems with symbols that Ive needed (i.e. packages are either all installed or auto-downloaded). The interface is simple and feels exactly like what I would have expected a TeX program on the iPad to be like. So useful!
Gigglebot3000 about TeX Writer - LaTeX On The Go