I've just replaced an old first generation i5 cpu plus motherboard and memory with
this because the power supply failed. I checked the power supply with a multimeter and it was perfectly obvious straight away that the 5V rail had gone trotters-up (it was only delivering about 2V) but fortunately I managed to persuade myself that there must also be a motherboard problem, in spite of the lack of evidence. This meant that I had to replace PSU, processor, motherboard and memory (might as well go for faster memory, eh?).
I don't do much gaming and get by with an incredibly cheap Nvidia G200 graphics card, so I have nothing to say on that front, but some things were a revelation. Being encouraged to overclock the cpu up to 4.7 GHz by a program supplied by the motherboard manufacturer (Gigabyte) with the click of a button in Windows, and still having it run at 25C under load, updating the BIOS from Windows as though it's a trivial change (yes, I know that's been around for years but not on anything I've owned).
All very fast and very stable - especially with an SSD (from on-button to useable desktop in under 30 seconds - that's better than my blu ray player).
Best of all, I discovered that the incredibly irritating hum from my case that's annoyed me for the last couple of years or more isn't a fan as I had suspected, it's an old hard drive. So obviously I have to buy one of those too.