You can click for the offer here for 50,000 miles + 5,000 miles for an authorized user. United miles are much less useful ever since the last devalution and so i would rank them at 1.5 cent a mile putting this signup bonus at $750 value + $75 value which is not bad for $2000 worth of spend.
United miles are still useful in some instances and so i would not be against signing up for this card ( i already got it) . However i would reccomnd you signup for the chase sapphire first if you don’t have it here you only get 40,000 miles + 5,000 miles but with category bonuses you will make more miles after the first few months and chase miles are fully transerreble to a number of airlines.
How to Free Travel 