I'm always fascinated to hear different experiences with FiOS. My father-in-law had it installed earlier this year as an upgrade to his uber-crappy DSL. He loves it. So far it's tons faster and more reliable than DSL.

I have Cablevision/Optimimum Online in my house, and have for about 5 years. Fortunately, Cablevision upgraded their infrastructure to support speeds that match FiOS. So, while I'm not a huge fan of Cablevision the company, I have no reason at all to switch to FiOS.

For folks that currently have DSL and have the option of switching to FiOS, do it, it's a no-brainer.