I did the update last night using SEUS and it worked like a treat until I tried to restore my data. I have three separate back-ups and none of them are being read properly. The memory card in general isn't being read properly which is probably the reason why it can't do this. I've spoken to orange almost continuously since last night and they are clueless as to why it's not restoring contacts. Although on one occasion I had to explain what a memory card was to technical support!! Not good!!
So do the update but back everything up so you have copies everywhere and use things other than the supplied program as well!!