Let's see. The first encounter came when I was in high school. I was on a trip to Washington and we met with a Supreme Court justice. I asked if they ever regretted a ruling after they saw its effect across the country. It was so long ago that I forget exactly what the answer was but I think it was something along the lines of the fact that they do see the ramifications of their decisions but that they don't let the possibilities of what might happen when they rule interfere with the process they follow to rule correctly on the law when they are writing their decisions. The conclusion I reached after hearing the answer was that the justices believe Congress and the president can always change laws if they don't like the way laws are playing out across the country, but it is their job merely to interpret them and rule on how they must be carried out.
Other encounters with justices have happened since in similar public settings and once in a judge's chambers, though I don't want to be more specific for obvious reasons.
My conclusion about the intelligence and seriousness of federal judges in general is that they generally operate on a level at a minimum slightly higher than the average intelligent person with about 5 percent of them at a level of heightened intelligence on the level of the most elite medical doctors.