I had a puck type GPS but decided that it was too finicky. When the computer wasn't interfacing with it, it couldn't be used because the GPS didn't have its own display or power source. Often the interface between the two became unstable and the computer couldn't find the puck. With my handheld GPS and a USB cable everything seems to work fine. When the GPS quits talking to the computer (for whatever reason), the GPS is still useful.
There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217