300 level seating is actually the 2nd level/club level at Invesco Field. Not bad seats.
Section 301 is in the corner of the endzone. Overlooking the tunnel that the Broncos players run in and out of.

Relatively small sections which is the main appeal of club seats. Only 20 rows. Section 300 is to the right and the rows are very small-great for a small family.
Expensive seats, more affluent section. For the price you pay for the view, none of the 300 level seats are worth it. I like being close to the field. That's just me.