I purchased this device after reading several reviews and just being focused primarily on price.  I've had it now for 3 days and it is great.  I use a 700w, so despite the other review, this works great with my 700w no issue whatsoever.  Yes it helps it to be on the same side as the phone, I carry my phone in a holster on my side, when I moved it to my left side as I was talking considerable static showed.