My brother-in-law just had his installed, and I must say, it's the best picture I've ever seen. HD is awesome, even the regular digital channels are crisp and sharp. He's got a dell 42 plasma.
I had their fiberoptic internet service installed last week and it's great. Can't wait till their fios tv service is available in my area.
If it's available in your area, go for it. My plan 5/2 is only 29 dollars/month, compared to comcast 1.5/.3 which was $39/month. The only things is, they remove the copper interface/wires outside your house, so once you switch to fiber, theres no going back.