Yeah, it's really impressive. It's not a huge surprise given how much the game grew and matured during the final months in beta, but it's really great they didn't just rest on their laurels and start churning out meaningless content.
I really like the way the UI looks now, something about the font is cleaner and tighter, so more information can be shown at a glance. Compare a character sheet from when the game first launched (my first character) to one from a party I rolled up for the 3.0 beta patch, for example:
Note right off that everything fits on a single line, and how they moved skills to reside just below attributes. I really like the color coded defense symbols, too, and the breakdowns you get when you click on just about anything, which they did a decent job with before but is much cleaner and easier to follow now, I think.
Those colored defense-type symbols serve a nice purpose, making the tool tips a bit more useful "at a glance", too.
The spells and many other items are now wide - this also allows the information to be conveyed a bit more cleanly, and I really like that they cleared up the "base" stat information. I loved it, but it made the spells and abilities a little muddy. Plus, you can still click on the blue info (like damage or range) to get the breakdown of how much is modified by stats and such, and you can still click on purple to get details on rules/mechanics (I just realized these colors might be off; while not color blind myself, I really like the blue selection circles more than the green ones so I have colorblind mode enabled, this may be spilling into the color coding of the linkables in the UI).
Even items have been cleaned up, compare my beloved Azureith's Stiletto from my first play through to when I just ran into it this last weekend. New artwork even!
Just a ton of little improvements here and there, it's getting so polished you can see yourself in it.