Pretty good with one major oversight.
Over all I give it an "OK". It gets the job done, the tub seems sturdy and like it should last a while. I think the bubble action could be stronger but it's adequate. The biggest complaint though is that the heat works too well, and there is no way to turn the heat off without shutting the whole thing off. Even on the lowest heat setting after a while it becomes uncomfortably hot, and low, med, and high are the only options, you can't leave the bubbles going but turn off the heat. Major oversight by the manufacturer, but other than that it gets the job done.
Rating: 4 stars