BrightHand reviews Garmin iQue 3000 GPS PDA and concludes that a decent but not extraordinary GPS-oriented handheld, the main draw of the iQue 3000 is that it’s simple and durable. If you require GPS on hand all the time, plus basic organization and PDA functions, this might make sense. For most people, though, the 3000 has little to no benefit over a Bluetooth GPS receiver and separate handheld.
The Tungsten E2 and a SiRF III-based Bluetooth GPS would give you better performance with a lower price, while a Dell Axim or Palm TX and Bluetooth receiver would provide greater functionality and features for an equivalent cost. Garmin iQue 3000 is a one and a half trick pony which may work for a few folks, but isn’t going to set the world on fire.