Yes, you can tell the difference in taste and tenderness.
But, as the guys pointed out, you have to know the pack date or kill date (some beef processors list the kill date instead of the pack date) before you can safely wet age.
I wet age briskets for at least 30 days beyond the pack date and prefer to go 45 - 50 days.
The refrigerator that you use for aging the brisket should be opened as little as possible.
"Ron Rico, Boss. You can call me Captain Ron..."
The Naked Fatty!
Southern Q Limo Elite Gravity Fed/FEC-100/Memphis Pro SS/PBC/LBGE X 2/SBGE/Mini BGE/Nomad Pellet-matic/Good-One Model 42/WSM X 2/Cookshack Smokette 008/Weber Performer/Saber Cast 500/Weber Kettle X 2/Weber Smokey Joe/WGA/UDS/Coffee Roasting Gasser