This is my first computer build, and I'm loving it so far. No significant issues with any of the parts, although the CPU cooler was purchased after the fact to replace the relatively noisy stock cooler that came with the 2600. I've also fiddled with the fan configuration in the case since building; I originally had two exhaust fans in the top and back, and two intake fans (140mm) in the front, but some reddit critique and online reviews recommended running this case in a negative pressue configuration due to poor air intake from the front of the case. Currently, I've only got the stock rear exhaust fan and a CM 140mm fan in the top, and temps seem fine.
Gaming performance is about as expected with an RX 580 (which I've currently got overclocked to about 1460mHz), and my only complaint is that the GPU fans get noisy, even with a reduced fan curve. I normally play with headphones on though, so overall, I can't complain too much. I've been playing Metro: Exodus, The Outer Worlds, Kerbal Space Program, Skyrim, Fallout 4, and a few others, and most everything will run on high settings at 1080p with no issues. In some of the more intensive games, I had to shy away from some of the 'ultra' settings to keep framerates high, but this suits me just fine.
Overall this has been an extremely rewarding experience, and this is an attractive and capable computer for my needs. In the future, I'd like to upgrade to the newer RX 5700 or 5700 XT card, but I can't justify the cost right now since I'm getting decent gaming performance so far.