I have one of each. The cell phone interface is nice, particularly for
calling flight service for clearances in podunk airports. The sound
attenuation is marginally superior in the 303g, and stereo sound from the
satellite radio is superb.

However, you are also correct in that the battery life of the 30-3g is
shorter than in the 25xl. Comfort wise they are similar in weight and feel.

I'm thinking about buying another 30-3g for my wife, and having my son use
the 25xl on his fat head so he can watch DVD's in the back.