The symphony air cooler is best air cooler that are available in the market. Their is a reason I say that because my dad has tried different air coolers none of the last this longer.
The Simphony air cooler I got at my house is rectangle in shape not very big one but the one which fits our window.The air cooler has got to controllers one for controlling the speed of the fan inside and other for controlling the cooling(thats the intake of water).
My dad has tried few other air cooler but they didnt last longer so we had to buy new one every summer. The symphony was one we are using over 4 year for now and we are really happy with it.