Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ever seen a painter use one of these? Me neither.

There is a reason pro painters never use these things....they do not preform as well as a good brush. Think about it, if a painter could save and hour per room by using this tool, don't you think he would have a whole box full? These things are for people with no idea what they are doing and are satisfied with a mediocre paint job. You are probably going to paint a lot more rooms in your life time, so do yourself a favor, buy a really good chisel edged angled brush and make yourself learn how to cut in. It's not that hard and then you won't waste any more money on these cheap gimmicks.