In case anyone is interested, I tried it on various images, and found that it was prone to artifacting. Take a look at the McDonalds article, and look at the bookshelf image. Unless I am mistaken it shows artifacting in the form of a halo around an object in the distance.
I did find an interesting article on compositing multiple images to maximise DOF:
http://www.nikoncafe.com/vforums/sho...hlight=helicon
Harry S. also indicates that Helicon Focus introduces artifacts. Anyway, he is clearly a very experienced and capable person, and I recommend anyone interested in this area read his posting. I would not presume to add to it (mainly because I can't ...)