I agree with cola. We looked around, dry and wet tested, and finally bought a beachcomber 730, but in the end, when choosing between equal tubs it came down to the dealer - their service level and integrity, and we have no regrets. We love the tub and the dealer has been a gem. They test your water and give you a computer printout of exactly what you need to add. I go once a week, but has told me to come every day if I'm not sure about my own testing. We have been given gorgeous beachcomber towels, all kinds of sample chemicals and great advice. If you're a newbie like me, that kind of support is priceless. For us, the whole hot tubbing adventure has been nothing but positive!