[Galaxy Note 10.1 (2014 Edition) General] BarryH_GEG:
Here's my take on the update. I haven't commented on the things talked about in the first post as it would be repetitive. As always, YMMV.

Performance:

Pretty much night and day. I have a huge number of apps and widgets so I represent the extreme. Someone said 4.4 was N3 fast; not quite but pretty close. Those with less crap than I have should notice a huge difference.

Battery:

Hard to tell. I had a bear of a time getting 4.4 installed via Odin with it failing half-a-dozen times. For some reason my N10.1-14 barely charged last night and stayed at around 35% over about 7 hours. It charged fine and almost fully during the day. I'm using it pretty heavily today and I'd guess my battery is better than before; it's certainly no worse. It's going to take a couple of days for me to get a complete read on where battery life and charging time lands.

Multiview/Pen Window

You can add tons more apps out of the box. Apps available are now common to both multiview and Pen Window. You can now directly open Pen Window apps without using Air Command or having to draw on the screen. You just open the multiview panel from the right and tap an app (vs. dragging it). A box comes up allowing you to open it in traditional multiview mode or floating like Cascade view worked on the OG Note 10.1. Pretty cool.

Tapping the box with the "+" sign shown below opens an app in a floating window, the box below it opens it as a standard multiview window.

Daynote's gone/Trip Advisor wallpaper works:

Daynote no esta aqui, at least on the Panama ROM. The travel lock screen wallpaper’s been fixed for the 2,560x1,600 display and it's gorgeous. It used to look funky to accommodate portrait which doesn't exist on the N3 from whence it came.

Lock screen widgets still exist:

At least on the Panama ROM and/or my configuration.

Apps that have been noticeably cleaned up:

Mail - Cleaner, flatter, faster. Push has been added for GMail like on the N3. The new widget sucks. Combined view is the only option and the font used is huge and non-adjustable so in a 4x3 configuration you can see three e-mails.

Browser - Really nicely redone and a lot faster. Headers and controls have been re-worked so there's more browser content and less "stuff." Zoom seems less neurotic with sites opening consistently in the set viewing size (85% in my case). Reader-mode now has a night view and integration with S Note and Scrapbook. The bookmarks widget can't be re-sized anymore it's fixed at 4x2.

Scrapbook - Cleaned up and a lot faster.

S Note - Faster with some additional editing controls I haven't explored yet.

My Files - Better organized with additional filters/options for drilling down to find specific content.

S Voice, S Planner, Video Player, Gallery - Cleaned up and easier to find stuff and navigate

Problems/Issues

None yet. Long pressing the period gives me a question mark, playing with the notification panel while watching video’s fine, and I have no issues playing back video. I had to side load Samsung Video for Hub because my country didn’t support and the 4.3 version FC’s on 4.4. [MENTION=3193415]nrage23[/MENTION] was kind enough to upload the new version and all’s good. So, all-in-all, I’m a happy camper.