Built a MicroATX PC for my brother. This was my first MATX build and it went really well. He also got a new desk and some RGB LEDs to go with it. The only problem that we ran into was the GPU not fitting quite right but we simply loosened the mobo and moved it over a bit to get it to fit. Unfortunately, the budget did not allow for a modular PSU but most of the cables are hidden from view.
Possible future upgrades include interior led lighting, more RAM, and PSU extensions.