Not had a problem with my carradice, but as I said, it has a suspension system to reduce the knocks – I think generally most panniers would transmit a fair bit of shock through to any on board laptop (I know soft fruit never survives too well!)
Previous to that I used to use an Edinburgh Co-op backpack which was fine, but I had an ultralight tiny laptop in those days, now I have a brute to carry and I don’t think I’d like that on my back for too long.
Weeble, best thing to do is take your average daily load to the shop and see if it works okay in the bag of choice, load up and wonder round the shop for a bit, everyone is different and what suits me will never probably suit you sir!
Hope you get something you can be happy with, I hate carrying shoes to work, don’t really know why! hot desking sucks if you can’t get any sort of locker to store stuff in.
Craig