I purchased the Loud Enough IEMs for my kids earlier this year and am very pleased with the results. Having volume control on an iPod and in the IEM just reinforces the safety factor. While not audiophile quality, they are still working fine and in great physical condition. The fact they are not earbuds is also nice in that by sealing outside noises, my kids don't have to play the music louder in loud environments (or outdoors). The counter to that though is that you have to be careful that your 7-year-old doesn't become oblivious to the world (e.g., traffic).
Not a bad option for the price and peace of mind.