All I can say about MK Ulterra is WOW! The "Deploy and Stow" functions worked flawless. Fished in 3-10 mph winds the last 2 days. I trolled down a rock jetty until my fishing partners caught a fish and then I would Spot Lock for a few minutes. Then resume again. I Spot Locked once when 2 people caught a fish. We all started getting bites and catching fish and I actually forgot about trolling motor for about an hour. I couldn't promise that it held location within 5ft (but close to it) but it definitely was unbelievable considering the wind. Maybe at most the drift would be 10ft.
I am thinking on fabricating something to stabilize the shaft when motoring. I do not like that long shaft flopping when going across rough water. Any ideas?
Another Minnkota product that I bought was the 12ft TALON. It is super quiet & quick and held like a charm 10+ ft deep in 10mph wind with constant waves rocking boat. On my sonar, I saw many what appeared as a gouges where an anchor had dug in and then pulled out and drug across bottom, then there would be another spot 3-4ft from that where they tried again.
The only thing I regret: is not getting 2 of them for the back of my boat.