I can't say I have that much experience with it and I haven't see the videos but so far I'm very happy with mine.
I prefer keeping it in 'manual mode' (i.e. not hooked up via nmea to the chart plotter) so I can't comment how well it keeps to a charted course to a waypoint, etc. but it steers me in the direction I want to go without any 'hunting'. There is an adjustment to minimize that but I haven't needed to fiddle with it. I just make occasional course adjustments manually via the port/stbd buttons.
I've use mine up/down waterways under power (excellent, nails the direction you want to go) and coastal sailing under sail/power. In 'cross seas' it will continually have to put you back on course as the seas 'twist' you around so of course under sail it would be a power drain.