Tree,
I started looking at a 1350 GTP and ended up
with the 1500.
I could be wrong on some of these, but:
2500 has all metal deepseeking mode
2500 ground balance manually adjustable
2500 suface elimination, adjustable
2500 has "Treasure Talk"
2500 has a 2 box option.
Just matching up the features I went with the 1500.
Do not think I will be needing a 2 box unit
Did not want the "Talk Feature"
(I talk with myself now and would really
be confused with a third voice)

Had the opportunity of working with another persons
1500, that really made the final decision for me.
Folks who have the 2500 seem to be pleased.
I am pleased with the 1500.
Have never run them side by side.
have a good un...............