I was never satisfied with SI on my HDS 7. Really didn't like the gigantic transducer hanging 7" off the back waiting to get knocked off. So I sold the transducer . My buddy has an HB unit with SI and his transducer looks like a regular one.
However, looking at the live scope and hearing all the talk that would be the way I'd go. Only one problem; actually there are about 4000 problems ($) so that's not happening anytime soon.