15U daughter has always worn Diamond iX3 and iX5 models. Knees were getting bruised and sore only after 1 year varsity and travel ball with iX5's. Researched all the brands and concluded All-Star "appeared" to have done their homework. Knee cushioning and gel pack were very welcomed by my daughter - beating everyone else's "foam pad" which wears out quickly. If your daughter is dropping to block, then invest in quality gear to prevent bruising and pounding the knees take with cheaper brands.
Travel Ball Dad and Coach