I have the hensel and love it. As already stated, I'm not sure I always use it in the right conditions or not. I don't use it all the time either. It's just another piece of gear that gives me options. Note to self: (go to Rolando's Atlanta workshop to find out how to best use ringflash. Yeah, that's it, that's the excuse I'll tell the wife.)
The benefit of the Hensel is that you can go mobile with it. Well, it's more luggable than truely mobile. Point is, I can shoot on location away from AC power with it.
If that's not a big selling point for you but you still like the idea of a ringflash, then wait and look into Alien Bees. Rumor (confirmed by AB) is that they're coming out with a ring flash. They just haven't been too forthecoming with details.
Travel is fatal to prejudice, bigotry, and narrow-mindedness. --- Mark Twain 1835