It's far less intuitive to use than Word (i.e you'll need to go on a course/read a manual) but produces better results.
Word is really designed for writing letters - it's not built to deal with massive documents. In LaTex if you put a table in a particular place, with margins defined, it'll stay there, rather than developing a mind of its own. If you change the order of subsections, the numbering will get updated automatically. It doesn't try to auto format things. In short, it produces a far more stable, more attractive document. But it is a bit more of a challenge to use, and you'll want to use it from an early stage in your writing, because if you just paste a load of stuff from Word you will lose the formatting you've already done (bold, italics etc) as it has a different way of doing it.