For a look at the most popular portable air conditioners on the market today, check out our portable ac unit review.
Perhaps the best feature is how many BTUs you get for the price. The reviews also list a number of other positive features, such as an easy to use screen and light weight. In a portable ac unit, weight is an aspect often overlooked until you are trying to wheel it across carpet.
The biggest negative would be that with that much cooling power you have to consider air pressure more. A cold zone in your house may cause other parts of the house to change in temperature.