Yep The Mini GPS has a very sensitive GPS chipset which is not effected by small objects such as pockets, briefcases, cars, etc being in its line of sight with the satellites. The other bonus to this is that it can pick up very weak satellite signals that other GPS units might not which gives a much more accurate position.

To quote someone from the BB forum:
"Received mine earlier this week. Started using it (read playing with my new toy) immediately. Very accurate and quick response rate. Has now replaced my Garmin portable in my car for travel. The claims that it works in your pocket or in your briefcase are also true. Using it with Google Maps, mainly because I am a creature of habit and it is free! "


Even though I work with them this is still my new favorite toy I have been playing with some tracking software recently which records journey information (speed, distance traveled, route, etc) which could be quite handy and its pretty fun to mess about with as well