I have an older bounty hunter IV Ive just begun to use it other than at the beach on vacation and I'm enjoying it greatly. Now, the wife is getting me a prism IV for Xmas (i think) IS the difference night and day?? I'm getting good at the tone iding on the tracker (usually can tell scrap, but I still dig) and pin pointing but what i really want more of is the depth. The other perks are a bonus. What Im asking is will i be much happier with a prisimIV than the trackerIV? and is the depth better on the prisim?? thanks