I am totally happy witht his product, however there are a couple of little things that keep this from being 5 stars. Firstly is the cord length, really needs to be a couple of inches longer so that it can clip onto your shirt at chest level rather than right under your chin or near your ear. Secondly is that it is supposed to be able to connect to a gaming device i.e. PS3 but I cannot get it to stay connected.
The volume slider is actually really simple to use, you just slide your finger either way along the strip and keeping your finger on the strip you can move the volume up or down to however loud you want. It is fiddley if you don't know how to do it properly but I can now adjust the volume very easily, although not whilst wearing gloves as it is TOUCH sensitive.
The sound quality is excellent for both music streaming from my iPhone 4 and for voice calls. I was very surprised at the actual qualty of the voice call as it was very clear through the headphones even though I was walking down a busy road as I was talking.
I was also impressed that the caller ID worked with the iPhone 4, it came up with the number first, then the contact name, very nice touch as this saves you taking your phone out of your pocket to see who is calling rather than just answering the call & it being someone you didn't really want t o speak to.
The device is really easy to use / connect and the OLED display is great as it also has the time displayed. FM raido was really easy to tune to whatevr station you like and stays at the last station you were on every time you go back to it on the device and calls are automatically streamed through even when connected to the radio.
Overall a very nice product at a decent price as it is a very good brand in Sony.