I did a post-Challenge bag of West Lion yesterday. As glorious as the views and day were, the climb is not recommended for casual baggers without climbing experience and/or ropes and psychological fortitude. It would be crazy to attempt it in anything less than perfect weather conditions: a hint of rain or ice would make the traverse very unpleasant and dangerous.
The scariest part of the climb is at the base, where one must traverse east along a series of 75 cm-wide shelves that slope gently towards a near-certain deadly fall on the rock slopes 45 metres below.