I bought the MB6 and I can’t say enough about the quality this tub was produced with. I decided to take self delivery instead of having the company deliver the tub. When I got to my house the rain had washed out my dirt road and it was extremely bumpy. I drove very slowly down my drive but I know I was being pretty rough on the tub, reguardless I got home and wired it up and it works perfectly!! Well crafted spas!