more dihedral means more roll stability. The higher dhedral angle used to be typical of trainers... most often 3 channel (rudder, elevator, throttle) trainers...

The result will be a model that WANTS to fly straighter and won't be as aerobatic. Inverted flight is harder to learn when dealing with large amounts of dihedral (it wants to fip back upright)

A model can have too much dihedral... but it takes a LOT of dihedral to be too much. Go ahead and fly it. The Sturdy Birdy is a good trainer. (a bit heavy... but not awful)