EXPORT FIRST! Rated 5 out of 5 stars
Always, ALWAYS, export your bookmarks before updating! Just in case. (I learned the hard way).
It takes a few seconds. If the Update messes up & loses them, you can import them again. Another few seconds.
Otherwise, I'm finding it very useful - I have it on my home & work PCs & my laptop on the other side of the world, & they all have my latest bookmarks in perfect order.