In reply to remus: I don't think there is really anything wrong with the inner for one person. It isn't as tight as it ought to be, but with only one person inside, you won't be touching the inner, and it keeps midges and mozzies at bay.
The poles seem good to me and although the bag is light I think it will be fine if you treat it reasonably.
I've just been reading this blog:
http://ultralightcycling.blogspot.co.uk/ which has some interesting ideas on weight saving.