But these Acheive 100s have a much slimmer case which can be put in your jean pockets easily and have 98% of the same sound of the Champion, I think it comes down to if you prefer the sound as perfect but are ok with a larger case (positive for some for higher battery) then go with the Champion, theyre $80 right now. I guess Ive learned a valuable lesson. I cant imagine not having it! I think these would work best for kids three and up. 5-7 toddler in shoes. This is my third time ordering this shoe. If they had arrived in the correct box there would have been no room for doubt and it would have been 5 stars. I bought this a few weeks ago and have been using it. Update: it’s been almost 4 months since I’ve first used this case and it’s still great and in perfect condition! I’m not happy about this, as the feel of each shoe is discernibly different.