I think RR varies tremendously depending on your local provider, but I have had it for about a year and a half and have been quite pleased. I have Cox Cablevision in Norman, Oklahoma and it is excellent. The mail service has gone down a handful of times but they are normally able to service it while still leaving it operational, and I have never lost a message even during mail outages.
I have only had one outright service outage, and it lasted about 2 days (unfortunately those two days happened to coincide with the theft of my car, so it was painful not having service while stuck at home and wanting to research replacement vehicles).