I've had mine since spring 2014 when it shipped with Windows 8.0 and its performance has met my expectations through the updates to Windows 8.1 and now Windows 10. It had WiFi issues reaching my older router in 2014 but upgrading the router was the solution; this computer itself was fine. The only bugs it suffers from are those introduced by Microsoft's Windows 10.
I bought this machine and I seriously wish I hadn't. Minor bugs abound, making me want to smash it on a regular basis. The touchpad randomly disables itself, no, I'm not doing it by leaning on a function key, I checked. I love the fact that it switches easily to portrait display, but it's a shame this stops the touchpad working. No, it's not the case that I just need to use it at 90 degrees, I could do that. It just straight up doesn't work.
THe "12 months free antivirus" that I was forced to buy, "included in the price," actually expired after 30 days, to be replaced with nagware. Dell customer service don't care. Oh, and the touchpad buttons are loud, stiff, and clunky. Other reviewers mentioned this, and I thought "who cares?" Well, I care. This machine sucks.