Before I owned a Garmin...I owned a Mio C320
This mio C320 was the first GPS unit I owned. For what it was, it did its job well. It did not have the bells and whistles, the same easy to use intuitive user interface of the Garmin GPS I owned later, but in truth, it did not need it. This unit was not ahead of its curve or feature-laden, but it never let me down as far as its navigation. If you end up purchasing a used one for a good price, it is likely to provide the same level of service for you as it did for me. A caveat: if you are planning on using this navigation in places/roads that are newly built/constructed or not likely to be listed, you may run into difficulties of this unit now being able to locate/navigate in these areas. When I owned this unit, I did not update it so I am not sure how this process would work.
Beverly Hills, CA