The GPW side buttons feel more sturdy and have much less travel time. I ordered the size 8 and was too small (I could not get the front of my foot comfortably in the front portion of the shoe). This is sort of hard to explain but if you have this, Im sure you understand. The only downside is the amount of space the case takes inside your backpack. So we played around with it and noticed something seemed off, so we pulled up the Amazon order and noticed that the item inside the box was what we thought was the charge 3 but it was some crappy looks like knock off speaker. Great to be able to replace my worn out ear pads which saved me having to buy new headphones. I cant slide them on, theyre kind of sticky. Another benefit for this particular shoe is the lack of odor that accumulates over time. But the fabric over the foot is just too narrow. Ordered again size11 .