It's tiny ! It's inexpensive.
The device is very easy to use and lightweight. Last time I tested it, it logged continuously for more than 20 hours
Pros and Cons
+ I like the size, the autonomy, the precision and the price.
- I don't like the fact that you need to install a driver to communicate with the device from a computer.
I owned a DG-100 before and was satisfied by the product, the DG-200 is just better in every aspect.
You should consider a driver-less device, it would be nice if the device was seen as a usb storage key, containing nmea or gpx files.