"An extremely cheap way to cool a small room, if you can tolerate its noise and inefficiency."
The 8,000 BTU rating is a lab-condition number. In your home, this single-hose unit will effectively fight itself by pulling warm outside air in as it exhausts hot air, making it truly effective only for spot-cooling a small, well-sealed room.
This is for someone on a strict budget needing immediate, temporary cooling for a small space like a dorm room or home office. Its primary virtue is the exceptionally low upfront cost, but this comes at the expense of high running costs and noise.
Anyone sensitive to noise, concerned about electricity bills, or needing to cool a room larger than 200 sq. ft. should look elsewhere. A traditional window AC unit at a similar price offers superior efficiency and often lower noise.