To give you an idea what the view of the field is like from section 121, here is a Youtube video shot from there during a Tigers/New York Yankees game at Comerica Park.
Most seats at Comerica give you a prime view of the game. These seats let you catch the game up close. The only problem is when people come back from the concessions and obstruct the view of the game (i.e. a groundball to first, but you can't see it because some guy comes back with food). Overall, they're great seats and give you a wonderful experience, but there are some issues with obstruction.
Comments
www.youtube.com/.../