I was looking for an Air Conditioner unit for a small room in my home. This type of portable design is perfect for my requirements. I was also looking for an Energy Efficient unit with the lowest BTU so that the Wattage is less, to save money on electricity usage charges. This is the only unit I could find with the lowest BTU (5000) and lowest Watts Per Hour, from a well known manufacturer. Installation was easy and took about 20 minutes. I had to measure the width of my window and carefully hacksaw the plastic panel with the hole for the exhaust tube. The exhaust tube is flexible, folds out to any shape and turn for the installation. The Grey adhesive rubber tape and Black foam liner provided with this unit are very helpful for installation. If the room has been hot for the entire day, it will take several hours to cool it. (BTW, It will take the same time to cool the room with similar specification Window AC.) But after the temperature is obtained, the unit easily maintains cooling. The unit goes off when the digital thermostat reaches the set temperature. There are multiple settings and all can be operated with the full function remote control with digital display. The “Swing” function helps cool the surrounding area faster for immediate relief on hot days. The plastic panel and tube remained in the same position even during Hurricane Sandy. I removed the unit in November. I was expecting the reservoir to contain some water from condensation but to my surprise it was completely dry in spite of a very hot and humid summer. This may be because I had not used the unit for several weeks which allowed any water to dry off on its own. I recommend everyone to read the instructions carefully before and during use. It took me about 10 minutes to re-install the plastic panel and exhaust back on the same window this summer. Its easier the second time because the rubber tape and plastic panel are already cut to window dimensions and the tape remains in the window. The black foam which goes on the top portion of the window goes back in its place easily. The unit uses much lesser electricity than other wall air conditioners in my other rooms which are higher BTU specifications because those rooms are larger. I measured that the unit uses around 31 Watts on "Lo" fan, and around 575 Watts while the compressor is ON after the room temperature is stabilized. (The electric usage fluctuates between 400-700 watts before temperature is stabilized.) One thing I noticed is that the exhaust is too powerful on this unit. I have to firmly close the door or the negative pressure in the room due to the powerful suction of this unit, pulls the door open if it is left slightly ajar. This may be because this unit is designed for a slightly larger room than the one I am using it in. My room must be about 10 feet x 10 feet. Using ceiling fan or personal fans will help cool the room faster by circulating air within the room. This unit does not become dirty easily. The smooth surface prevents dust from sticking. The handles on the two sides help lift it easily and the top handle allows positioning. (The unit is not heavy in my experience.) Wheels on the bottom help slide it or cleaning around it and moving to store it. I kept the box which has helped store it during fall, winter, and spring. The tube can be folded back into it's compressed position which can be stored in the top Styrofoam which has a section specifically for it. It is called portable because it is possible to move it from the window to storage or a second window of the same size theoretically. It doesn't mean you can just move it to any window at anytime. The plastic panel, foam, and rubber tape provided will cover only one very large window or two small windows of the exact same size. Last year after I purchased this unit, it went into “Out of Stock” status for the rest of the year. I was lucky to order it just before it disappeared last year. Its good to see it back in “Available” status this year. Overall, I am very happy with this unit, it's features, it's performance, and the price for it. Thank you Walmart for this excellent product, affordable price and almost Free shipping.