After reading good reviews on this, I dove in and ordered it w/ confidence. So far, I've been very impressed with it, as has all the people I've shown it to. Most can't believe the large and boomy sound coming out of this little sucker. After opening its shell to reveal its bellow, extending its voice box, the bass comes through. It's still not earth shattering bass, given its small size (physics limitations), but it's enough bass for enjoyable and natural sounding music. I love the bluetooth wireless function, and made me realize how much I hate wires. Now, I can never go back to wired devices. The phone call send/receive sound quality all seem to be good, as verified by friends who called and spoke to me thru this device. Also, it's great that you can control your mobile devices thru this thing, like volume, and next/previous song control. The size is perfect to put in your pocket for traveling, and even a stroll down to the coffee house. It can be used in your car filling it up nicely with tunes. I love it! It can also go quite awhile between recharges thru USB port. For the price, this device gets a 5 stars!!