OK, here's my experience, and a question...
Actually, question first: On my SP3's type cover, the touchpad wants to go the wrong direction for scrolling. That is, to scroll the display down, I have to gesture upward on the trackpad. I know I could change this in 8.1, but I can't find where to do it in 10.
Anyway, I did a clean install Friday night of 9879 on my i5/128, then installed the driver set from September, -- at least that's what the downloaded driver set I had onhand was dated, so maybe it's really from August? -- then let Windows Update do the upgrade to 9926. So far, no problems. I haven't tried playing videos yet, but I have had no display problems at all.
I'm not sure I like the scrolly far-left start menu, either, so I'm busy putting all my critical stuff on the start window and quick launch. I haven't tried pen input yet, either...probably later today. The "folders" on the start menu are a little odd as well...I don't seem to be able to move icons around very consistently, and I wish there was an option to delete a blank group name field.
Overall, pretty happy so far, except for the trackpad scrolling thing.