We purchased our Luna Rock spa a couple of weeks ago and are delighted with it .  It is just the right size for two large people and is even o.k. for 3 or 4 if you are well acquainted. We especially like the bubble jets and the ozonator.  We use ozonators for other health purposes and we think the ozone in the water may even have a therapeutic circulatory effect .  We thought the lights might be frivolous, but find that we really enjoy them.  We installed the spa in a sunroom with good ventilation and are especially looking forward to using it in cold weather. It is really relaxing after a day of physical work. Great purchase!