Verizon FIOS TV is a super service - the high def quality is excellent. They provide all the local high def channels in the Phila area. (810 to 817) including 2 PBS digital. The sports and movie package provides 12 national HD feeds - TNT-HD, 2 ESPN, NFL, 2 HD Net, Univeral, Discovery, Wealth, Nat Geographic, MTV (if you are interested), Showtime, TMC, and Starz. Cinemax and HBO are also available. The DVR is VERY stable - in 6 weeks we have not had a lockout or silent death - which happens too frequently with our Directv HR-20's. Channel changes are extremely fast - even when going from low def to HD.
The DVR only holds 20 hours of HD and you can only get one of them (they only have one set of IR codes). They use the Motorola box which looks exactly like the Comcast unit. They are working to activate the USB and Firewire ports to permit and external hard drive for more capacity - no date yet.
The install was glass smooth - they use real Verizon techs, not contractors. The install was free.
The lo def is not as good a Directv - some video noise around the crawls on CNBC and Fox News - but is is better than it was in December - these guys work fast to fix their problems.
FIOS TV is now our primary service - we will keep Directv also but will buy more premium feeds from Verizon once the external drive is available.
If you can get FIOS TV, I highly recommend you do so.