I got the i9-9900K RTX-2700 version for video editing and 3D animation and I really couldn't be happier.  I had priced out a system with similar specs to build myself and was about ready to pull the trigger when this computer came out for Black Friday and the system was more power for less money than building it.  Plus I wouldn't get all the cool lights (which I don't need in any way, but when I do live streams and tutorials, it makes for a fun added visual element.)Adobe Premiere and Blender and everything else runs faster than it ever has.  I did opt to add more RAM.  Mine came with 16GB in two 8GB sticks.Mouse works very well.  Has adjustable sensitivity and has extra buttons, but is not customizable.  Was very slightly disappointed with that.  Keyboard isn't my favorite key press feel, but I'm very picky, and it's not bad by any means.So far, I'm as happy as a clam!  It looks cool, is quiet, and most of all screams through everything I can throw at it so far!