I remember seeing 10,700 in a 22 in the Drakensberg's, SA. Circling around the highest peak, and a frozen waterfall, followed by a 5 min autorotation back to base camp at 4000' and it was wonderful.
Heights don't bother me but the oddest feeling of height I have experienced was enroute from Durban to the Drakensberg's where the ground level progressively climbs and we were flying at approx 4-5000 ft AMSL but approx 50' AGL (temporarily), upon reaching a large cliff the ground suddenly dropped away by 2-3000 feet... It certainly made our stomachs jump
I had always believed that one of the height limitations of the 22 is due to the time to get it down on the ground in an engine fire... Maybe not true, but good enough reason for me to not choose to put myself unnecessarily far from terra firma