Originally Posted by
joseeantonior
If you're a Premier member and have Premier tags, do you use them?
Yes.
Originally Posted by
joseeantonior
If so, do you put them on your checked luggage or your carry-ons?
Carry-on. In 2 reasons:
1. It is meaningless to put that with your checked baggage, given how your baggage is being handled.
2.
DYKWIA? 
Originally Posted by
joseeantonior
Also, do you request *A Priority tags to be put in your checked luggage? Yeah, those bright orange ones.
No need to ask, as this is what UA supposes to do,
AT ALL TIMES.
Originally Posted by
joseeantonior
Finally, do you use the plastic card they've given you? Do you prefer to use the digital in-app card? Why?
Plastic, because:
1. As a 1K who travel mostly international, the physical card is my way-in to non-UC *G lounge (My boarding pass, paper or digital, is sufficient for UC).
2.
DYKWIA?
Seriously - @HKG, where I am based, UA GAs have difficulty to believe that I am entitled for Premier Access (as they always point pax to regular Y line). I would have to either ignore them or show them the card.