Update:
I tried demo-ing one yesterday with a student. With 10 gallons on board... got to 250-300 agl, 60 kts, reduced power to 20" then rolled off the throttle and entered auto. Ground comes up awful quick. You got to be on the ball, but there is enough time to flare and do a power recovery, albeit with the horn blaring. I certainly wouldn't do it any slower or lower or heavier, and I certainly wouldn't let the student have a go at one as there ain't much time during the maneouver to f*ck up.