We call them progressive lenses in Canada and I've been wearing them for about 6 years. They're great as far as I'm concerned, but it did take me 3 or 4 days to get used to them. I had problems initially with some distortion of straight lines too, but the optometrist made some adjustments and the distortion disappeared.

Make sure that lenses are big enough or you are going to hate them. Small and stylish won't reward you when using progressives.

I currently get a stiff neck because my computer screen is now about 2 inches too high for me after we did an office reno. I'm getting a new monitor this week that will be adustable for height, so that should solve the problem.