Its a great time saver, finished two coats of painting in 1500 sft. basement in two days.. with around 3 hours of actual painting time. Instructions are detailed and may seem scary at first but pretty intuitive once you've done it. There are some YouTube videos online to get familiar with painting technique. I'd suggest wearing a painting vapor proof mask as the regular masks don't really help and are not enough, specially when doing in a room or area that't not very open. Don't forget to prepare the area before starting to paint, like covering all items in the work area as paint vapors would be all over and would sit on each object.
used to much paint, hard to under stand the direction, went on line to watch beginners video. Used 2 gallons on a 10x12 bedroom, only got 1/2 of one wall done and 1/8 ceiling, 1/8 of another wall done. that's it.. lot's of overspray. And paint ran on the wall. I followed the directions to the T (I'm thinking I did ) or .... It just may be users error.. from my point of view it was loud and hard to understand... but what I did get painted it was a good job.... that's why I'm giving it a 4.