I had two learning experiences
I had two learning experiences with it. One you are limited on how big of a slab you can do, due to the bag concrete mix drying too fast as you are laying it. Possibly would have worked if I had help or used a slow cure concrete. Second is use only fresh bags. Any clumping from old bags of concrete will plug up the shoot and make it a pain. Once I figured it out, it works flawlessly. I am able to do many concrete projects on my ranch by myself.