Asynchronous vs Synchronous Queries

So  I want to do a n-tier WPF app. I don't need the aynch queries but I would still like to use the BOS because there are some calculations that can run in queries on the server and only the results have to return or some don't have to return anything to the user but write directly to the database after the queries are done?

I am used to writing client server apps in which the user populates a grid of records with which they want to work. they click on a record, edit the record and save the record and move on to the next record. What benefit does Async queries do in this case, the user cannot select a record until all the rows come back and they see the one they want.