Humminbird 525 (Portable)?

I am looking to buy a portable fishfinder and could get the Humminbird 525 from a buddy for $80 (He has never used it).  Anyone ever use this fishfinder or have any advice?  Main use will be to find structure on the North Coast...

i have had two 525 and they work good, it dose get a little confused at the delta with all the veg, but is plots the bottom well. I like it cause of the big screen, but i wish it had a plug in like the eagles so it could be more portable.