56 gr. 20 hr Nokia/cellphone battery (I have used it for almost 20hr so that is true), Bluetooth works at 10 ft paired with a Belkin dongle. Charging is done through mini usb connector. Plastic case seemed a bit on the cheap side. $60 (w shipping) ebay. It has an on and off switch, 3 LED indicator lights (charging, GPS fix, bluetooth detect)
Software: Very basic. Win XP only. It allows downloading the logger data to a text file, and the conversion of the text file to google maps KML files. The software also allows you to change GPS parameters, and clear the buffer. Oddly the software on the CD and posted to the forum works, the software on the official support/download page is a draft version that does not. All communication is via Bluetooth (SPP), there are no drivers.
GPS. For keeping a record of your route to review afterward it was fine. Sure once I logged onto Google maps I was riding through some buildings and occasionally in the river. But I was able to review my path. I do not have a pda so I do not know how useful it would be paired with one (I see no reason it would not). I had no trouble with the bluetooth. Inside a commuter train it did put me way off course numerous times. The device operates without need of a PDA or other device, you turn it on and it keeps track of your motion. When you return you download to your PC.