Optimum user for a few years. Don't have FiOS in my area yet, so nothing to compare to, but I'm fairly satisfied with OO. The speed is GREAT. The customer servi

Optimum user for a few years. Don't have FiOS in my area yet, so nothing to compare to, but I'm fairly satisfied with OO. The speed is GREAT. The customer service, much less so. I've had a few instances where a neighbor cancelled their service and had my line taken out as well by the technician. Also, there's always Cablevision's wonderful random down times to deal with. That being said, it's the one of the fastest downstream connections in the country AFAIK, and certainly the fastest in the city.