Yes, we are near Oakton HS and most of the residential neighborhoods around the school have buried lines. The main thoroughfares do not.
I live on a street with buried lines and I don't have frequent or long outages, but be realistic: all buried lines come above ground somewhere, even if just at the sub station, and that spot can have issues that lead to outages.
This. Our neighborhood has buried power lines, but we have had outages. Power lines are often above ground at some point before they come into neighborhoods. And in fact we had an outage that had to do with a problem with the buried power line. Yes, they dug up and replaced.