Question about SI and Locating Brushpiles

[slabbandit]

I have just been sitting back and reading what you guys like and dislike about the HB SI's. I need a new trolling motor worse than the SI right now so the SI will come later.
My question, Is the GPS problem with marking a distant brushpile and then accurately navigating back to it? This would be one of my main reasons for getting one. Can the unit display the coordinates as it marks the brushpile and can those be entered into my ETREX handheld for more accurate relocation?
Listening to Jeff White and some of the other guys I think I'll opt for the 997 over the 700 series that I was looking at. Sounds like I don't need to rush into this thing as they don't seem to have the bugs all worked out yet.