Howdy,
Read through the posts.
Just downloaded and installed the accidentally released April 8th RTM Windows 8.1.1 update. 700MB, 20 minutes to install the
6 updates (the 355 update takes a WHILE to install, the others are faster). They need to be installed in this order (don't forget to reboot if the update asks you to):
Windows8.1-KB2919442-x64.msu
Windows8.1-KB2939087-x64.msu
Windows8.1-KB2919355-x64.msu
Windows8.1-KB2932046-x64.msu
Windows8.1-KB2938439-x64.msu
Windows8.1-KB2937592-x64.msu
Notice that this "update" is really only a series of UPDATES lumped together. So it does not involve any radical changes or break any programs that I can see. My Stardock Start 8 and Modernmix both work fine for instance. If you are on the fence about updating, don't be. It really is a trivial update. No worries, mate.
As for desktop users, it is a meh update. Frankly, nothing in it for us unless you want to pin Metro apps to the taskbar.
As for the Metro changes? Power button, minimize and Exit buttons in the top corner and a power button. Taskbar (auto hide) is now on the Start menu.
And as Edwin said, a Metro app closed with the exit X button STILL is running in task manger. Grrr.
I have found one bug fix for me and I hope another, more important one. The trivial bug fix was that after coming out of sleep, the Wallpaper slide show would not change the background image until I "kick started" it by changing it once myself. Then it would shuffle through my hundreds of images. That is now working properly again.
There is a HUGE post from some frustrated Win8.1 users that cannot get their computers to automatically sleep after they installed the Win8.1 update. 86 pages and counting (we tried everything)! I am hoping that this update fixes that.
http://www.eightforums.com/general-support/28226-windows-8-1-refuses-sleep-86.html#post354658
Bottom line? Go ahead and update. It is only minor changes and bug fixes.