First time trying G.Skill as a brand and I have to say they are excellent! Stable machine and very fast, just make sure to enable XMP from the BIOS to run at these speeds. I have them on Gigabyte Z370 Ultra Gaming 2.0 and they work great with the Core i7-8700. The RGB lighting is the best and enhances the interior of the case! Highly recommended!
5/5 Stars!
Update 20/5/2018
-------------------
Be careful for those who download the RGB management software from G.Skill. If you use it in combination with other RGB management software like MSI Mystic, Asus Aura, or Gigabyte RGB Fusion, it may rewrite the SPD of the memory and "destroy" it, causing the lighting to not work properly or not turn on at all. I was never a fan of RGB, but these caught my attention because they are discreet. In my case, when I downloaded it in combination with Gigabyte RGB Fusion, it simply messed them up. Once I uninstalled it and did some research in the Task Manager to find the process that was causing the issue, everything went back to normal thankfully! It may vary for each person. Overall, without the G.Skill software, they play beautifully in Rainbow mode with all colors vertically, and in my opinion, they don't need anything more. Everyone does what they think is best, I'm just sharing my experience. There are users who are more demanding and believe that if it's available to the public, it should work perfectly. Okay, just be cautious! I still give them 5/5 stars because the memory is excellent. The behavior of the system regarding RAM memory has never changed. They are fantastic! Now, if I had to evaluate and rate the G.Skill RGB management software, let's not even go there! However, everyone says that G.Skill is working to solve the problem and ensure smooth operation of the lighting and compatibility with other RGB management software. Personally, I won't install it again! They are beautiful as they are, it's not the memory's fault if the software provided by the manufacturer doesn't work as it should.