Rolf,
I sail the HT singlehanded and its awesome under 10knts - flat water, flying the spin. Every other boat in the harbor is standing still and the HT is cranking along. Very cool.
My only worry is righting it, I cant right it by using a righting line alone. And worrying about doing it with a bag or a pole takes some of the enjoyment out of it, I dont feel like I can press it as hard.
Thats one of the reasons I got the A cat, I wanted to be able to sail it alone, and be able to right it without any worries.
Bill