The 9500/9900 seems like overkill for an 11 yr old. It is a little bigger and clunkier with more plastic than the 7500 - 1.96 lbs vs 1.17 lbs. That's a small weight difference, but may be noticeable to an 11 yr old.
I would rate the 7500 as very adequate. It is very well designed and well built. The strong plastic outer shell and foam core inner shell provide plenty of protection and adds soft gel pads at the pressure points.
Overall, I am very happy with my 5500 and 7500 (essentially the same) and would recommend it to others.
Date published: 2017-05-24