I got a 797 this spring and have used it some. (This side business I started after I retired is working me to death) I really like the unit and am looking forward to getting it in the river here and finding stuff. When I got my new chip I tried to get one of the 3-D versions and they said it wouldn't run on my model. It would be interesting to have that on the system and run a split screen with the side imaging.
I have run into the problem you talked about with the large GPS symbol when you are going back to a marked spot. That should be a pretty simple fix. It covers about and acre and a half of water no matter how far you zoom in. :D
I really like the side scanning feature and wouldn't trade it for anything out there right now, but I wish someone else would get into the market and cause a little competition. I'll bet there would be a flurry of neat improvements coming out in a hurry. Something about MBA's and their marketing studys and business plans that make them want to squeeze everything out of you they can. We just have to keep after them.
________________________________________
A day late, a dollar short and two drinks behind.