I ordered a Dell desktop online in 1999 to be shipped to my apartment. I filled out everything including an evening phone #, but not a daytime #. A week later no shipment so I call Dell and they say they need a daytime #, so I give them my company #. Another week goes by and no desktop. At this point I am needing to use the desktop. I call Dell and they say the company I worked for (the daytime # they demanded) was a little behind on payments so they decided to take my money in recompense and not ship me a computer. I had to go to the CTO of my company and have my company repay me. Incidentally, the Dell's we used as servers with Red Hat would freeze up all the time.
So yes, I have avoided Dell since then. I have been relatively happy with their competitors, so why go back? My only personal experience with them was a bad one. Other sysadmins I have worked with would go to the trouble of migrating from a Dell server environment to an HP one, when new machines were needed, because they felt HP servers were superior to Dell, and it certainly seemed that way. I don't know what their desktops are like as I was never shipped one. There is a reason their stock has sunk and they are going private. Yes the market has shifted, but they did not shift with it - Apple and other companies have.
I have a System76 Ubuntu laptop. As I have a tablet and desktop, I don't need to use it much. The one problem I have had is battery life. I have been too busy to really look into it, I don't know if that's normal or if I can tune something.