I upgraded for several reasons, 1 is bigger screen and 2 is Lowrance is a more powerful unit, 3 lowrance quality.
I upgraded to LCX15
For the money the 480 is a good unit. If you can afford moving up to a Lowrance you will appreciate it. I know folks who have switched from Lowrance to Eagle and have not been happy.
Lowrance is more of the pro grade graph and eagle is more of the weekender grade IMHO.
I make a good portion of my living fishing and I need a quality sonar.
www.txcatfishguide.com