My dentist told me that my manual brushing was absolutely not enough, and was vehement about that I needed to use an electric toothbrush AND a Water Pick (or compatible.) I found this excellent portable model at a fraction of the name brand cost, and it had enough positive reviews that I chose it over the others.I'm glad I did! It's got a substantial capacity, more than other models I found, yet is also self-contained and portable. I've used it in the shower and on the sink. It comes with spare tips, so my wife and I share the unit and I simply used nail polish to mark hers with a blue band to avoid confusion; I wake up earlier, so I just remove the tip, put in mine, floss, refill and return her tip. It's convenient and doesn't take up as much room as two units would.I don't brush twice a day, but I have found that a quick evening floss with this unit makes a big difference; I can see what's removed, and there's a lot less buildup the next morning.Very highly recommended!