I have noticed several threads saying that they have underground service and haven't had any or very little power outages at their homes. Having underground wire only helps an individual that has lot's of tree in ones yard that may fall and disconnect the power, however most power outages happen miles away from ones underground services making that part of the installation useless.
I'm a great believer in a FULL home backup electricity both when one is a seasonal resident with a heated home or if they are year round residents. One has the greatest peace of mind just knowing that EVERYTHING will be working when it is needed. I have been on the lake now for 54 years (seasonal/full time) and installed the generator 2 years ago and it sure was well worth it for my wife and I. We can take off for any length of time and not worry. We also have an alarm to notify us if temp goes to low for a burner service problem and whole house security/fire alarm is always doing it's job.