We've been to many events to to T-Mobile but our latest one was the PAC 12 Championship. It was a great game and great experience overall. I got my tickets via StubHub. This was my first time getting tickets through them and it was easier than expected. I had to actually pick up my ticket at the StubHub location in Dean Martin. If you pre ordered, all you have to do is show ID and boom tickets are yours.
As for parking at T-Mobile, if you don't mind spending $20 then park across the street, North side of the arena. Best way to enter there is through Frank Sanatra. Not a lot of people know that back entry so not too many traffic there, compared to LV Blvd.
Our seats were at the upper level, Section 225 Row B, to be exact and the view wasn't that bad. The steps are pretty steep tho so prepare for a workout going up the steps.
Overall, we've had nothing but good experience at T-Mobile and shout out to Metro for controlling the traffic and keeping things safe as well.