Ok, thanks, I didn't realise that chain was still available. The only place I've seen one is on a Lifeline chain whip. The X10 chains, which are advertised as compatible with Shimano and Campag, are slightly wider than Shimano chains, but work better (in my experience) with Shimano groups than Shimano chains do.
Edit: should probably add, my experience is of Ultegra and X10-93 chains on 105 and Ultegra cassettes, with 105 shifters and mechs.