It’s great but you should definitely not turn it on right away and should brush your teeth for a few seconds as if it was a manual toothbrush just to make sure the toothpaste actually gets on your teeth, otherwise it just falls off if you turn the toothbrush on.
I have used Waterpik products for years! I used two separate devices to brush and to floss. This saves me time twice a day and my teeth feel always clean. An improvement to this device would be a stronger pause every 30 seconds for tooth quadrant change. I use this to brush and then floss/rinse toothpaste from my mouth.