FishingFool34 brings up a good point about screen size vs SI/DI. Screen size is a big deal, especially with imaging, but that comes at a much higher cost.
I fish a lot of unfamiliar water, so I like having SI/DI on at least one fish finder, especially because I fish for multi species on several different lakes. I find myself NOT using SI on the lakes that I have fished a lot.
I agree, and I like the big boards for Lake Ontario. But I also troll with inlines on Oneida, Cranberry and other lakes as well.
I have Penn manual riggers already, with two of the short arm models on my little boat. I would only be interested in the 2 planer arms and the planer reel you have. I have an extra long arm Penn rigger that I could put the 2nd planer arm on.
I was curious about the planer booms because I've never seen them before, and never heard of them. I run inline boards right now, and I haven't convinced myself that I want to go back to running a big planer reel/board setup yet.
Big boards take up a lot of room on a boat. Inline boards are easier to store. Big boards track better than inline boards. They both have their advantages and disadvantages, as you know.
I use side imaging to locate and look at structure, so I think it's worth it, especially for multi-species boats.
I have an 1198c SI, so the SI isn't as clear as the modern SI units, and fish are harder to spot on my 1198 than on the new units.
Don't expect the fish to stand out as easily as the do on 2D sonar, but as Chowdaire mentioned, it gets easier with practice.