I have the 600, and really enjoy it. Like yourself, I did the research and watched a plethora of videos from setup to underwater hunting. I would suggest making a cheat sheet initially until you commit the numbers to memory. I made a cover for my unit because of the slop I was hunting in, and taped the sheet to the top of the cover so I could flip it out of the way when not needed. It only takes a few outings to dial it in. If you’re a dig it all person, then the sheet is unnecessary.
One thing I have started doing is hunting with my machine wide open with max sensitivity and all metal mode. I change only when necessary, which is when the noise starts getting annoying. Both sensitivity and all metal can be quickly changed without getting into the menu system.
Good luck and happy hunting. It’s really an easy machine to learn.
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