My only complaint is the plastic slots arent cut quite wide enough. If I dont keep at least one carton under it, I think it may reach the bottom of the shelf after a couple days! After looking a little closer at the product, it appears to have been imported from China for resale here in Canada by a third party (Not Sony). I wish the grey had been available when we bought it, but it wasnt, so I settled for the slightly muted neon blue. The big resistance housing does get warm in use ?there is an internal fan and I guess it depends how hard you can push this thing! However, after I changed back into my old slippers, I noticed that one the left side of my foot still hurt. Sennheiser is known for great sound products. If i could give zero stars i would. Not bad for what it is, but the wire connecting the earbuds is way to short. Just got my first pair in the mail today, and I can already tell it won?t be the last!