However, it also allows for further customisation, so URLs can be EXACTLY what you want them to be for each page, improving not only your site's exposure to search engines but also making things much more friendly for your visitors. Also helps to hide the fact that you are using Joomla! which you might want to do for security reasons.
Please ignore previous reviews stating how complicated this module is. Within 5 minutes (literally) of downloading the core module and an example template (the horizontal suckerfish variant) I had a working dropdown menu system on my test site, working perfectly in both Firefox and MS Internet Exploder.
I found everything to be very simple and intuitive, you just need to take 5 minutes out of your day to read the "install" paragraph on the developer's website. The module, however, can get very complicated and in-depth by the looks of it, allowing you to use it as a very powerful and highly customisable tool on any Joomla! website, but to get started it really is very simple.
Highly recommended! I can see myself using this more and more in the future, it's going to be so very useful, no, essential!