I purchased these headphones because my two previous wireless headphones stopped working on one or the other side after a year and a half. I am using one of the old headphones plugged into one of my iMacs and now they give perfect sound on both channels. I tried to connect them with an extension wire directly with my extension cord but only one side worked. So I am extremely happy with the JBLNTune on-ear Headphones.
I bought this to listen to my lecture recordings and music when I'm studying. I don't have to raise the volume on my computer past 6 and it is perfect. cuts off most of the background sound around me and I can focus really well. Overall, an amazing purchase and it is definitely helping me.