I tried early this morning and it failed on both my iPhone 4 and iPad. Nothing damaged at all - just failed to verify with their server. I put it down to 5 times ten to the twelth people flogging their servers today, because Lion also had upgrades as did many apps such as iTunes, iWork and others - and they were all released on the same day. Wow - across all their major platforms. Hectic or what! LOL
I'm putting many of the bricked iPhones out there down to sheer impatience - and people trying to restart or disconnect before it was ready. Mine failed, as I said, but the failure did not affect the devices at all - it occurred pre-restore.
Well, I tried again this afternoon and although a 64Gb iPad with about 52Gb of data on it took over an hour and a half, it went smoothly and ended up with a brand new iOS5 sitting on it. My phone is nearly done too. The process is a full backup/flush/upgrade/restore jobbie - so it does take its sweet time. Have a lie down and come back when it's done.
iOS5 is quite loverly! Love the split iPad keyboard...