Yes, Mr. Slims work great and they are fairly inexpensive. They have been on the market for a long time and have a proven track record. These units save money in terms of operating costs versus a conventional forced air unit with air ducts. The units have variable fan speeds so there is no reason the indoor unit will make excessive noise if you clean the filter regularly and install/maintain the unit properly. The outdoor units can make a bit of noise but most a/c's make plenty of noise, especially the compressor. I have not used the LG art cool, can't help you there. As you probably know, these units normally require professional installation. When installing consider placing the outdoor condenser in a shaded area or providing shade for the unit. You will be glad you took the extra time to plan for shade because it will make save you money and provide better comfort.