mATX case smaller than ASUS AP201?

The asus case arrived and it's huge. I hoped to size down (don't have any measuring tools) but it's as big as my current one. I'm very uncomfortable and would love to return it but cannot find a replacement. Should I keep it? I hate: -branding -RGB -wasted space (I've no HDD, disk drive etc so I only need cpu, mobo, psu and gpu spaces)