i have done lots of reading and searches.. i see most problems stated with the Z 1 or 2

to those that have done the the harddrive update/swap out or those that spent the money and bought the Z3

can you tell me your experience with bluetooth,

how is the sound?

where is your Mic located vs you?

The bluetooth doesnt change at all. The Mic sound still sounds the same within the other Z series. Some has reported that the upgrade fixed the low volume issue on the Z series and some others said otherwise.

For example my mic is located right above me and it sounds good. Others at the receiving ends are able to hear me just fine. Never the less I rate the upgrade a good roll-over.

Best

can they tell you are handsfree ?

Some say yes and some say no. However from experince yes they can tell. Also it depends on the phone model you have. Never the less I rank it Good, not to bad and not perfect.