In reply to Mountain Lass & In reply to jlmaskey:
> Do NOT do it in anything other than walking boots!!
That's my general thoughts and I've never used anything other than full leather boots in Skye. That said it is personal - I have weakish ankles especially when they tire and so never walk the hills in approach shoes unless at lower levels. I also like boots for the loose stuff and the scree.
However, if someone walks and scrambles in approach shoes normally, and for endurance type hobbies, then Skye is little different for alot of the ridge length, and most of the scree is not usually done in the traverse. Also, guides regularly take clients up in approach shoes. They would not do that if it was a significant risk? I think it all depends on what you normally wear and how you feet, ankles, etc., normally cope with long challenging terrain.
To OP, use footwear you are happy with and know that supports your feet/ankles bearing in mind that the terrain/route is hard and relentless and will take its toll on all gear, take some gloves (preferably very cheap ones if your a very hands on scrambling person), watch out for lack of water and take enough or have some placed along the route, research the route beforehand the best you can remembering that paths and tracks go all over the place in the Cuillin - the actual route is not obvious in places.
Mike Lates, Skye Guides, has on his website useful info -
http://skyeguides.co.uk/information/the-cuillin-traverse/ and
http://skyeguides.co.uk/wp-content/uploads/2011/09/2007_Ridge_Download.pdf .