Do not bother upgrading folks if what you have works fine unless you have a pyschotic episode with the flat look of 8.1 and can't find classic start.
There are many many bugs. Items do not fill in properly in menus. Adhock wifi not available, disjointed tiles in TV and music, Edge crashing, Edge having no extensions, poor battery life on the surface pro 3, One drive not having placeholders, Grove not having select all on playlists, .NET 4.6 JIT tail bug where arguments get scrambled, and many many others in just the first few days reported
This reminds me 0f XP. Yes, XP pre - SP1. XP was not considered God by users and IT departments in 2001. It was buggy and had compatibility and network probloems before SP1 and SP 2 was where it finally got somewhat solid.
Windows 10 has an unfinished and baked feel. It won't touch my systems until Redstone update 1 something later this fall ... or maybe next summer as I see it more as just hittting beta now as MS rushed this.