I bought this unit to replace a failing 10,000 btu unit that I've had for years.  After reading many reviews for this and other products, I settled on the LW1216ER and I have not been disappointed.  The unit puts out an amazing amount of cold air and has kept my rooms feeling marvelous.
It was a tad complicated to assemble and get properly fitted in my window, and the pictures were a little too small to make out all the details.  Also, the unit is quite heavy, so I don't look forward to taking it in and out each year, but I figure that the weight is an indication of good quality construction.