The new revision 8.1

Yes u can download it, no problem with it actually the only problem i can say is the backup to the icloud never been completed but u can do the backup to ur computer...Its nice with the new version and simple.

Be careful!! I ran the update last night & 20min later my ipad3 was completely frozen. I powered it off & when it turned back on, I had to connect it to iTunes for a factory reset. 4hrs of updates and NEVER had problems SMH

Feels like apple is putting out crap now that Jobs is gone. The last update made my ipad run slow & freeze constantly

It wasn't put out today, but three days ago ... :-) ... and people have "been all over it" ... inside and out.

There is a thread that was put up the same day it came out, three days ago, and has quite a few observations about it.

Report on the NEW iOS 8.1 Revision Today

AND ... if you decide to update it to iOS 8.1 from iOS 8.0.2 ... then you should do so as a "clean system" and not over your present corrupted system files on your current system. To do that, use your iTunes program, and reset to factory default. This will give you a clean and fresh system, without any corrupted system files, just like it came off the factory floor! And ... always make sure to do your backups. The iTunes backup is preferable.

Choosing an iOS Backup Method (Should I Use iTunes or iCloud to back up ...)

https://support.apple.com/kb/HT5262

Back up and Restore your iOS Device with iCloud or iTunes

http://support.apple.com/kb/ht1766

iTunes: About iOS Backups

http://support.apple.com/kb/ht4946

iOS: Troubleshooting Encrypted Backups

http://support.apple.com/kb/TS5162

Use iTunes to Restore your iOS Device to Factory Settings

http://support.apple.com/kb/ht1414

Star Traveler is SO right about installing a new OS on an older device. It's MUCH safer and will clean out the crude you've accumulated on my device.

Updating to 8.1 was a waste of time.. I had done three full restores with two back to factory new by Apple "Geniuses" . This 8.1 update has only made my iPad4 worse.. Had eight freezes and re-boots this morning after a half hour of use.

I updated my iPad with the latest 8.1. Its not allowing me to connect to the wifi properly. Once i connect to the wifi, immediately it gets disconnected. I tried so many times but the problem continues. Now i am unable to use my ipad...is anyone else also facing the same problem.

i did a restore and installed 8.1

still terrible

I sent feedback to Apple today. Will you too?

http://www.apple.com/feedback/ipad.html

I'm running an iPad 4, too and with no problems. Now, what that means for "you" is that it's technically feasible for iOS 8.1 to run fine on an iPad 4. If it wasn't okay, then it would not be running on any of them. Therefore, you'll just have to keep going down the troubleshooting trail. And I noticed that you said you had been through several processes before ... but there is one process that I'm not sure you have done yet. Have you reset your iPad 4 to factory default through your iTunes program and NOT restored your backup? In other words, left your iPad 4 in the same state it was in, before you ever added any of your data or any of your apps?

That's a troubleshooting methodology in which you'll see if that iPad 4 runs as its supposed to "right off the factory floor" so to speak, and before you ever start using it for your own stuff. I would verify that iPad 4 in that condition first, before going any further with it.

Here are the links I've put up for doing that (including doing your backups).

Choosing an iOS Backup Method (Should I Use iTunes or iCloud to back up ...)

https://support.apple.com/kb/HT5262

Back up and Restore your iOS Device with iCloud or iTunes

http://support.apple.com/kb/ht1766

iTunes: About iOS Backups

http://support.apple.com/kb/ht4946

Create and Delete iPhone, iPad and iPod Touch Backups in iTunes

http://support.apple.com/kb/ht4946

iOS: Troubleshooting Encrypted Backups

http://support.apple.com/kb/TS5162

Use iTunes to Restore your iOS Device to Factory Settings

http://support.apple.com/kb/ht1414

Did you reset the Network Settings ... in Settings, General, Reset ... ?