I have the Braille note PK with the Cendero GPS.  It is very good!  The 
virtual modes, vehicular and pedestrian routes, and the points of interest 
files that you can add to make it very well worth the investment.  It's 
great for independent travelers, and surprisingly useful for people who only 
travel by cab, or with others.
You can for example select a category of points of interest, and while you 
are going along, only that category will be displayed.  Once we drove from 
Milwaukee to Chicago, and I had mine set on bars and wineries.  Can you 
imagine that?  Anyway we knew about every bar we passed.  You can make 
points of interest like your house, bus stops you use, ATM locations, and 
mailboxes.