I still have one of those. I used it for quite a long time, and it worked very well for Geocaching. There are a few things I like on it more than my garmin.
The installed map is limited to major roads. To upload detailed maps, you will need lowrance mapcreate, to download maps of your area. The memory is limited, so maps are limited to what will fit. That said, I have 1/2 of michigan loaded on mine.
For $20, I'd say give it a try.
Brian