powerful but not easy to clean [SEP] i had never used a water flosser before so was not entirely sure what to expect with this the first timeit takes a little bit of practice well it did for me at least to not get water everywhere i found the water pressure to be a little forceful at first but learned how to maneuver it to get it where i wanted it to go it does leave my mouth feeling incredibly clean and i much prefer this to using old fashioned floss the different attachment heads are very easy to switch out the only thing i am not crazy about is there is really no way to clean dry the water reservoir between uses i have followed another users suggestion to rinse out with an anti bacterial mouthwash occasionally which i suppose is better than nothing