hello and welcome aboard.
Like you I am new to the sport and also have a mio digiwalker (I've had mine for a while and think it's a slightly newer model then yours); however, I must say I am not very pleased with my mio. It's okay for navigating the roads but I found that trying to pinpoint a location with it is not very good, not only that but the unit does not update frequently and I find that I've past the pinpoint by the time it updates.
Needless to say, until I get a new GPS unit, I'm stuck with the mio for now, if you find you enjoy this, I suggest a new unit.
Speaking of new units, anyone who's reading, any suggestions for a decent / cheap gps unit? I would like to pick one up that is usable in my car and keeps a pretty well charge on the battery.
Any input would be great