Almost 5 star with only one minor drawback.
It has operated correctly, and as advertised, and is well-made. Overall I am very pleased and I would buy this again. This item deserves a 5-star rating in all aspects except for one minor drawback. The mode switch is adjacent to the on/off switch, and has the exact same touch, so it is very easy to misplace your finger and press the wrong switch. This results in water squirting onto my shirt or glasses or mirror or wherever until I can re-find the on/off switch. It would be so much easier to use if they had placed the switches further apart and made the on/off a little more pronounced. Luckily, I have trained myself to be conscientious about not letting my finger wander away from the on/off switch, and to make sure it is truly off before removing it from my mouth. So after a couple of months I rarely experience the problem.
Rating: 4 stars