I am very happy with this product. I have used it with both Motorola A630 and Sony Ericsson T637 and it has been great. It goes for several days without a re-charge. It fits snugly in my ear even while doing things. The headset is quite small and light compared to the ones I have seen. The design could have been little sleeker though. Motorola A630 as such suffers from feeble sound but with this Bluetooth it sounds quite loud and awesome. I have no static or voice quality issues. I definitely recommend the product.