There is a HUGE difference between the high end models and the way low end models. Think game boy original versus the matrix. Well, maybe not that much, but still. I started with a portable one, which was neat to tell the depth, and see snags and stuff, but the resolution was so poor that I couldn't tell what it was that I was looking at. Well, I figured it out and it was helpful, but my new finder is SOOO cool. It's color, so you can see different bottom densities and all those goodies. I'm still figuring it out. You get what you pay for. It's like buying a computer, spend as much as you can because it'll be outdated before you open the box. For a little more money you can have something that you can use for a lot longer, and won't have to replace when you get tired of it. Also get one that's water proof. The middle of the road models are so much better than the portable ones.