Note there is quite a bit of difference between the W8.1 update and the W10 update especially on the S3 Id call that a huge difference as the list of S3 W10 driver updates is lengthy. kinda makes you wonder if we're experimenting.
I updated my W8.1 S3 without issue, it's too early to tell what effect it will have.
Also updated the W10 SP3 without issue, again it's too early to tell what effect it will have.
Well, one thing I have noticed today - this is after the update and this is on a SP3 running W10 as upgraded from 8.1. I took the SP3 off the charger at 1:40PM today. It is now 9:40PM and the charge is down to 12% and the Battery Saver has kicked in.
No driver crashes of any kind. Aside for a time period of 90 mins plus maybe 5-10 mins when I was away from my desk when I was not using the device at all, I have been on it all the time. For the most part of those hours I have had fours apps open and active all the time: MS Word, Edge (2-3 tabs), Readit, Telegram. I have also from time to time checked for updates in the System App and in the Store App. Wifi and BT are on (I once - for about 30 mins - tethered the SP3 to my phone for an internet connection). I have not during this whole time shut it down.
To all intents and purposes, the update has not YET seemed to have done any harm.
In everyway the device has seemed stable.