This is my second build I've done, the last being in 2014. I specifically wanted to upgrade to an 1440p ultrawide monitor. I chose the Dell AW3418DW, which I'm super happy with. I decided to do a full new build, since my old system was starting to get out of date (GTX 970, i7 4970k).
The only hiccup during the build was dealing with the Corsair Crystal 280x case. Cable management was pretty tricky, especially because I had to add in an NZXT USB hub, since the mother board only had one USB header. I've never built in the mITX form factor before through, so maybe all cases are annoying. The other thing I'll say is that the Corsair H100i RGB Platinum SE is really pretty being all white, but it does not cool that well, and the fans can be pretty loud. I'm getting idle CPU temps around 45, and 70 during gaming.
Overall, I'm happy with how the build turned out. I'm able to play Anthem on max settings at 70 fps, and most other games I've tried hit 120 nicely.