Salams from Charlotte:
The benefits are that it's a LOT cheaper and easier than anything else for what it does. If you need an LMS, you won't find better for less... in fact you really won't find anything for less, since it's free.
So you have to decide if you need an LMS. If you do, then you can look at the costs - I think you'll find nothing can touch it. In addition, I'm confident that there are numerous technology savvy folks in your area familiar with open-source tools who can quickly ramp up - perhaps even in your own organization.