I just so happened to be carrying my pink tartan spotlight today, so I tried both crossbody and on my shoulder. I'm 5'8" and thin. If I wear it as a crossbody bag, it comes up higher than I would prefer a crossbody to be. But, you can always add in a smaller strap as an extender.
I can get both straps on my shoulder, but I'm not sure how long they'd stay there - and my arms are skinny! If they would have added 1/2-1 inch to the straps, they'd be perfect!
I still love my Spotlight, but I usually carry it as a satchel or use the long strap to wear it on my shoulder.