"A budget cooler whose real-world performance is far less than the number on the box."
The '12,000 BTU' figure is a lab value, while the '7,500 BTU SACC' is the actual cooling you'll experience in your room. This is enough for a medium bedroom or small living room, not the 450 sq. ft. claimed.
This unit is for cooling a single small-to-medium room where a window unit isn't an option. It suits a buyer whose top priority is low upfront cost and who accepts the compromises of noise and lower efficiency.
Anyone who can install a window AC unit should, as it will be quieter, more efficient, and more powerful for a similar price. Users sensitive to noise or needing to cool a room over 350 sq. ft. will find this unit inadequate.