In reply to metrorat:
Depends on the weather. If there are some storms in late Sept / Oct, that can build the faces up nicely. If it’s dry, there will be bugger all mixed potentially. You just don’t know these days...
I’ve never been at that time of year. Have tended to opt for March / early April as at that time skiing / ski touring is always a fallback if climbing isn’t in. Also ski in/out approaches make life easy. Having said that, the fact that October doesn’t have enough snow for ski in/out actually makes some logistically routes easier. Anything up and over is easier if you can walk off, so stuff life Jorasses NF, Merkl Welzenbach, Droites NF and I imagine Schmid.
Good luck! If it’s crap, you can always go sport climbing somewhere sunny further south...