One of the benefits of holding United Premier 1K status is that if you also hold a Chase MileagePlus credit card then you receive a $60 statement credit once per year in the second quarter of each year. This is the last year that this benefit will be offered, according to this page (see excerpt below, emphasis mine):
Credit will be posted once a year, in the second calendar quarter. Limit one per member. Eligibility for credit is based on Premier status at time of posting. Please note that this credit will be discontinued after the second quarter of 2016
United has added some additional benefits for 1k Premier members, they can now get a free alcoholic beverage and snack when flying economy.
Hat tip to reader Jessie M