I've ordered a few waterpiks over the years. This one is the best. It has a nice deep bucket for the water. I am particular about keeping my teeth clean, so I use the whole bucket of water. Sometimes I fill it twice. The pressure is adjustable. I started out with gentle pressure and then turn it up to highest setting. It toughens up your gums and really cleans your teeth. If you start using it at least twice a week in the two weeks before you have a dentist appointment, your gums will not bleed when the dentist cleans them. In my opinion, it is a must if you have implants or crowns.