I own one of these…paid $99 used on eBay when our baby was born two years ago. The built in battery makes it quite convenient and the sound quality is good. The fatal flaw is that it only supports WiFi 802.11g, no n! This can slow down the entire network. It also only supports direct connection of iDevices with 30 pin connectors (or lightning to 30-pin adapters). I believe it provides a 0.5 amp charge, so no iPads. Also, no Bluetooth, AirPlay only.