Well done matey #
Can't argue about price can ya eh.
Have you got the manual for the X51 (gees I feel like Maxwell Smart when I type stuff like that )
If not http://www.lowrance.com/Manuals/File...951_092002.pdf
Humminbird are just another sounder. Some people like them some hate them.
If your happy with the 'bird' stick with it.
But I had a 2005 deep and it was a pain in the butt. Bloody thing was trouble from the word go.
But BIA, to their credit, replaced it with a brand spanking 727 after my 3rd trip to them to get the 2005 repaired under warantee.
Still playing with the 727 getting it set up but if I had a choice I'd rather have my old Furuno LS4100 that's in the other boat.
The main problem with the Legend series is the rotory knobs. The seals let go and let water in. Once they're gone no point in fixing as the brass shafts on the knobs are stuffed too.
I had an old Humminbird wide one as a first sounder and the bloody wouldn't die even if I hit it with a stick. I think the durablity of it spoilt me for life.
The main difference between the two you'll have a choice of is the screen size (both physical size and resolution), the 'bird' is a dual frequency transducer and the X51 is most likely a single frequency transducer. And of course the 'bird' will have more power. Hoo, Hoo, Hoo and temp and speed as well.