Indeed, the priority option on United Airlines is totally worthwhile. This is because this option allows flyers to enter and get to their flight seats earlier than any other general group. Moreover, this United Priority Boarding feature is available to flyers based on certain attributes.

Flyers have to take seats in United Polaris business class, United First, United Business and United Premium Plus.
One can also purchase this priority option.
Being a member of MileagePlus Premier, Star Alliance Gold, MileagePlus Club and Presidential Plus.

To get additional information regarding the boarding group of United Airlines, flyers can read the blog post mentioned by Group Travel Airlines.

Read more: https://grouptravelairline.wixsite.com/flights/post/united-airlines-boarding-groups-a-complete-guide