Ok I do miss an ozonator but  the pluses out weigh that one negative.   I've made checking the chemicals part of my daily routine and it really is simple  We've had this for over six months and we really like it.  For us it's a great two person tub where we both can spread out. it's light enough for two people to maneuver easily when empty  on a large dolly ( my husband made the dolly)  which a big deal because I wasn't sure exactly where I wanted it and there could be a time when I would like to have my patio back if we have a large amount of family visiting . The electric bill has not been through the roof.  We use it a lot and it really helps with back issues. We have fun with the lights at night when we watch the stars and during the day it's a whole different experience when we sit back and listen to the birds chattering in the nearby bushes.   If I had to do it again I would.