I don't see a thread about this yet, so here goes. I installed build 10074 (latest on slow ring). Could not get the fast-ring build to install (10130 failed to install, twice). Short version is that it's quite a mess. Whereas 8.1 was zippy on the Atom processor, I find 10 to be slow - especially on web browsing but also more generally. Also, the picture-password sign in doesn't work most of the time; often the picture is not even shown. The worst part is OneDrive, which is throwing all sorts of sync errors I've never seen on my SP3 running 8.1. (And then there is the annoying "feature" that online-only folders no longer display thumbnails...) I might try it for one more day, but I'm pretty sure I'll revert. If they are planning to GA less than 2 months from now I can't imagine the 7/29 release is going to be much better for S3. Anyone's mileage vary?