I only ever had one person have difficulty with looking through a Stratus. They were mashing their face right into the eyecup and getting blackout. Once they got it, it was easy for them to use it.
I don't know if the 8mm is the best choice though. In your f/5 it's getting a little dim for newbies, and has not quite enough power for planets on its own and too much power in a barlow. I'd go with a 13mm.
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