Sorry, no apologies for raining on anyone's parade here, but just as exciting as receiving a freshly polished sword may be, and it is, the truth is that unless the sword has been polished by an excellent polisher the end results may be in both the long and short term not quite up to par ending in disappointment. And what could be worse is that the recipient may not have the background to properly assess the result or know the difference. After all, ignorance is bliss. In the end the sword owner may find out by receiving a disappointing and poor shinsa result leaving them wondering how that was possible without ever understanding why. Oh, yes, a shiny "new" sword, but what if some of the most critical factors like foundation and finish were not executed quite up to snuff or even incorrectly (for the sword)? Since, according to the Japanese, kantei is the very foundation for nihonto appreciation, wouldn't that make the choice of selecting the right polisher for the sword most critical? Which brings up the question of how do we really know? By simply asking? By looking at actual examples of the polisher's work (traveling to sword shows or participating in club events where you have the opportunity to see polished swords)? Choose wisely, do your homework.
Just food for thought.