Purchased 4 around February 2016 and wasn't really impressed with the foam output, no matter what I tried. I had to strengthen the foam brush chemical to get it to foam at all. Took way too long to engage. I took them off after 3 months due to not providing the foam that our customer base demands. Good Idea but it just didnt work for our situation. They are also fairly heavy...I cant imagine what the stainless steel models weighed considering these are on the verge of being too heavy made with aluminum. I have 4 barely used if anyone is interested. Make me an offer.