I bought the 797 and thought it would be the greatest thing since jigs. In my little fishing world all I need is a good GPS to find my spots and HB doesn't have a good GPS so I use my Garmin 378 and use the 797 just for sonar split with SI. I can't say that I have found anything with the SI that made me say WOW. With that said I'm not the guy driving around trying to find something to fish. I have those on my Garmin and it gets locked up in the safe when I get home if you follow what I'm saying.
If you don't make your own spots then you'll enjoy driving around with the SI.
The HB might be a better investment than GM stock right now.
Lots of ruck