Those boxes are small, but not exactly good looking. There's a plethora of companies releasing these compact form factor PCs. They also all look practically identical.
All of these "mac mini" style machines target the low end market. They all have low end processors & video cards. I have yet to see a premium machine like the mac mini that is available in a small form factor.
Don't own one, but just linking to give an example that there is a pretty decent looking PC Mac Mini clone out there.