You need to get one with the lowest amount of overspray so you do not make a mess with it at your clients. It needs to be light weight and quiet. We carry one that has a laser on it so you know you have it at the right distance for the least amount of over spray. I truely used it when I got started and then turned it off. The only time I use it is when I start using too much
solution and am making a mess. This way I can re-train myself as needed. Remember The more overspray the more you have to clean up and the less is going into your clients and making you $. Some people are really good at keeping it in the right spot and some are not