FiOS is Verizon's fiber offering, which they are now rolling out in limited areas. According to this article from someone who signed up for FiOS TV and then dropped it, there may be some real limitations (note: scroll down the page a bit to the "FiOS TV" title).
The problem is that FiOS partitions the bandwidth available to a home into three separate portions: TV, telephone, and Internet. But to do on-demand movies and video, Verizon has to use the Internet/broadband partition, not the TV partition. So as the note describes, you may see much of your promised bandwidth eaten up for a movie.
What's the problem you ask? Suppose you are working from home, using your FiOS broadband partition to connect to the company network for VoIP and company systems. It is summertime, and your kids are home. It's 10 AM, the kids are bored, and they order a two hour on-demand movie. For the next two hours, you may see your available bandwidth drop substantially. As the author noted, this may or may not actually be an issue, but Verizon would not provide any details.
In a open services, Active Optical Network (AON), vendors like PacketFront run all services in a single large network connection to your home, and on-demand video does not affect your Internet access because each service is managed end to end with guaranteed Quality of Service (QoS). It's a different and better design that does not have the limitations of the FiOS PON (Passive Optical Network) design. Disclaimer: Design Nine often recommends PacketFront systems for community broadband networks.
This limitation of FiOS and PON systems is a real and serious economic development issue. As more and more job and work opportunities allow people to work part time or full time from home, communities need broadband systems that fully support business use of the network. Communities that think FiOS or AT&T's Lightspeed services are enough may be disappointed as economic development in their region begins to stall out when workers and businesspeople discover these networks don't support business class services very well.