Update: FIOS in in the house.
Since I've been a FIOS Internet/phone customer for two years, my router was replaced. This required the running of coax to my loft where my office/computer is, because that's where the CAT5 run from the OT box ends. Other than that, the install was fairly smooth although it seems to me that it takes a loooooong time for all channels/program guide to load into the receivers.
(I find it interesting that the program guide is sent via CAT5, processed in the router, and then sent out via coax to the receivers. What advantage does this provide?)
Bottom line: My expectations as to picture quality have been surpassed WOOHOO.
SD: What a difference from the washed out blur provided by Dish! HD: equal to OTA quality. I did side-by-side comparisons with a local HD news broadcast. On both my 34" HD direct view Sony CRT and the 8' 1080p 004 in the theater, I simply could not tell a difference between the FIOS rebroadcast and OTA. And I'm picky (DUH!)
The interface is different, and will take some getting use to. The program grid is weaker than Dish's and the Favorites implementation is poor. But the remote is well laid out, and bright and colorful. In due time, Dish's very slight advantage in this area will be forgotten as I watch one of the best pictures available today.
BTW, the tech from Dish (sub) today removed my two dishes from my roof, removed all connected coax, and hauled it away. He smiled when I told him I have FIOS installed. "Everyone wants it," he said with a wink. Dish is sending me a box to return my 622. I'll try to sell the 501 (real cheap), and the one dish with the dual horns.