So, some of these things might just be complete coincidence, but others are recognized problems, so deal with it. :)
Pros:
1. It appears to have a hardware performance boost, better than the free edition
*That may just be coincidence!
2. It keeps a record of how much time you've been on Krita; just like how long of your life you've wasted on CSGO
3.(This is for both the free edition and this) It's built for digital artists, and can even be used as a alternative photo editor!
4. You can add custom brushes, and even make your own!

5. Your ability to use rulers and other accessories is FAR better than what photoshop can provide! This includes, but not limited to: *The Parallel Ruler, *Transformation Tool, *Quick Select, and many more!

6. Built-in Stabilization tool!
*Now I've used Krita Free Edition for nearly 3 years or so, then transitioned over to this. Back then, I used Krita's stabilization features and, OMG! It's a life saver. I now use Lazy Nezumi Pro (Which is also a life saver, but like, a life life saver!)

7. Shading is the easiest damn thing to do here, and I thank god for it.
*Going back to the Brushes, shading with certain brushes is okay.... but when you start mixing in Krita's blurring tools, suddenly the gates of heaven open up to you; angels sing by your side and Jesus himself is in awe of your abilities. Fur looks actually like fur! Eye glares are the greatest thing since sliced bread!

8. It's okay

Cons: (There's only a couple)
1. Rotating the piece is basically as unstable as your parent's marriage. Every time you go to rotate the canvas, the system just .... Dies. Now, I'm running a good computer;like, really good.

2. There's a delay when you go to undo a "happy little accident". There's this little delay when your keybind undoes something and it is so annoying you just ...KAJDF IAUHD

3.It runs okay, but support for linux is still a bit.. Mehh.

4. Animating has been just a tad bit funky since I first started. I don't think that animating was the main priority of the developer's attention, but it was just included to satisfy the needs of poor people who can't afford photoshop.

5.If you try to add text into a image, good luck. It's as functional as a dead dog trying to win a sled race.

Conclusion:
If you're looking for a good art program, definitely check out Krita. It is my primary Art program as photoshop became too much to pay. Being free, it appeals to basically every single organism on the face of ... the universe. Now, if you can afford it, Photoshop will be better in performance and it will also let your wallet lose a few pounds per year. If you plan on doing animation, best turn the other way, Krita is unfortunately one of the worst experiences I've ever had for animation. Other than that, it's a really good art program!

Fair Warning, you need to dedicate yourself a few hours to learn the program's everything; from the keybinds if you use a keyboard, to setting up your tablet's sensitivity!

Good Luck, idiots!