Fishless, I took a look at the 597ci HD that you have. It has dual beam plus and power of 4000W PTP, but doesn't have down imaging. I did take a look at the few models that contain both dual beam plus and down imaging, but for some odd reason, they lower the power down to 2400W PTP. That's a concern and I don't know why they did that. I'd rather fork over the money to get all features and at 4000W, but can't find a Hummingbird model like that. So, I may check out Lowrance at this point. Did you go through this decision point as well whether or not to get down imaging with less power or just get the dual beam plus at higher power?