I had a Dell 9520 i5 (no dedicated graphics), so maybe someone will find my review useful. I was very much impressed with it. Its fans were quiet even under load. I benchmarked it with Cinebench R23. The singlecore score was 1700 and the best multicore was 11800, which is very close to the i7 version. But I think the most optimal setting was the quiet mode - the score dropped only to 10500, but I could hardly ever hear the fans. The interesting thing was, that in Windows "Balanced power mode" with the during the single core tests, the thread scheduler preferred efficiency cores and the score was just 1500. I had to switch it to "Best performance".
I also tried running Linux (Ubuntu 22.10). It worked well, just the subwoofer didn't work (it's hard to write a driver for it) and the touchpad scrolling was too fast (general problem with Linux). There was just S2 sleep and hibernation supported - no suspend to RAM (S3 sleep) even with the latest 1.10 BIOS. When in S2 sleep, the laptop draind around 10% of battery in 10 hours, but there were no problems with it (waking up, fans running, being too hot ...).
The last thing I was worried about was the screen brightness, since I have sensitive eyes and usually run my monitor with low brightness. The FullHD screen is very bright at 100% - you can light a room with it when in dark. But at 20% it's just fine during the day and at 10% during the night. The screen doesn't turn off when set to 0%.
The build quality was really nice and the sound quality in Windows was the best I have ever heard from a notebook.
So I think this lowest configuration is a great choice for people who need CPU power but not a dedicated GPU. Especially if you need a lot of RAM or storage space, since you can put your own sticks inside (both RAM modules and 2 M.2 SSDs).