These things are great. I got four sets to install two pantry/ utility cabinets. They're 7 feet tall and 2 feet wide, and we're installed in a corner. I dont know how long it would have taken to install these cabinets the old fashioned way, but I'm sure it would have been a while. I got them perfectly level and plum in under 20 minutes, and that includes attaching the ez level system to the cabinets. These things are easy to install and use and seem very well made. The online directions and videos are very helpful as well. My items were shipped right away and arrived quickly. I would definitely recommend these especially if you've got a large bank of cabinets or are installing in a hard to reach corner with sloped floors. Worth the extra cost, saves on time and frustration.