The amount of hate for MS products in the comments is sickening. The fact is that MS Office is the leader in office software hands down. It's not even close. Most people produce a higher quality product, faster. When you are considering that in the business world, that matters more than a hundred dollars a license (the versions you pay more than that for typically have multiple license rights, meaning more than 1 install per serial number). My feeling is this is just more Microsoft hate because people/idiots feel it competes with Linux and you can't compete with Linux love on the internet. However, OpenOffice does compete with MS Office and what was said in the video is *generally* true.
Want an example of software that you could get free but people use the paid alternative instead? Try Adobe Photoshop and Premiere and Illustrator (or Corel Paint Shop Pro). Maya/3D Studio Max versus Blender (though, Blender does get plenty of love). Mathematica/Maple versus others. Visual Studio versus Eclipse and other spinoffs. If you think Office is expensive, take a look at Visual Studio Pro licenses (yea, 100 dollars isn't so bad huh?). VMWare Enterprise versus VirtualBox. I could go on.
Businesses know that time is money and there is a large amount of time spent writing/maintaining middleware for OSS, because no one does it already. Finding custom (or near custom) solutions to a real business problem is hard to do for OSS because industrial grade software developers (Microsoft, Adobe, etc) don't invest their time into those programs. Like it or not, this matters.
If you are a student, I can't understand why you would want OpenOffice. Word and Excel are superior to Writer and Calc (though, for college/school purposes, Calc may be passable) yet you get software like Access and OneNote (a program that no one is competing with right now... and if they ever incorporate the ability to take Math/Engineering notes it will be one of the 3 greatest programs ever). A single license student version can be had for $80 and contain everything you need/want (outside of SharePoint... but you probably don't want that). If you are a student, you probably can get financial aid to cover this cost and more.
If you are a business user, I already explained why you wouldn't bother with OpenOffice. If you are a really small business that doesn't need real support, maybe you would consider this... but if you grow, you may be asking for problems down the road.
If you are a home user or a FOSS fanboy, then I can completely understand why you would use OpenOffice. It's good enough to do what you need, then you should absolutely use it - which is what I have a feeling 99% of the people who are posting here trashing MS actually are (OSS Fanboys).
And before you go ballistic on me, I'm a software engineer (not for MS, I wish I was though, because they pay well, great benefits, great environment, etc). I'm not talking out of my rear.