In reply to Flinticus:
As above- taken direct the eastern side of the gap is a diff climb that has put off several VS leaders. But there is a way to avoid this by traversing the north side of the eastern pinnacle after descending the gap a short way. The traverse scramble to avoid the direct route is about grade 1, not too hard, but thrutchy for people who only do hill walking. If you do this the main hazard really is getting in to the gap from the western side- the usual path is now very eroded and steep and the rock is chossy, I tend to wend my way down slightly north of the main path, to avoid the gravelly slabs. Some dogs could do this, but most owners would not cope well with a dog in this situation.
I regularly lead this traverse for work, but have on occasion taken the decision not to take some clients across if they are not confident/sure footed.