I recently bought a used Lowrance LMS320. I still have a lot to learn about it but so far I really like it. My main issue with most marine electronics is they put so many more features on them than I would ever bother to learn to use. I can see where the newer units have much more software available for them from companies like Navionics. If I was able to spend as much time on the water as I would like I would find a way to buy a new chartfinder GPS.