I have the Garmin versa. My zone is mid teens to mid 20s. After driving 13 hours the reading last night was 32. I stay within my zone for the most part with an occasional low reading just below my zone.
I got the Versa for Christmas because of sleep troubles. I like the way it tracks the sleep stages. It has helped my by showing that I need to get of the couch or chair when it's bed time and hit the rack instead of nodding off and then waking up for an hour or two.
Thanks Carl I'll follow my HRV a little closer