I've never built a machine before. And so one day I decided to. I wanted something with decent performance while not being all that expensive. I watched some youtube videos on how to apply thermal paste and install the CPU fan, but other than that the building process wasn't all that difficult. It was a pretty fun afternoon.
I'll be using this machine mainly to play around with different things. I've thrown on Linux Mint and it seems to work great.
I think at some point I'll try and make it a server. I could use it for backups or even ssh in and run remote compute jobs. There are a total of 6 bays for hard drives. As I purchase additional drives I'll put different things on them. One drive could have all of my VMs. Another could have Windows installed on it...