Waterpik ION Water Flosser, Black, Cordless Rechargeable Countertop Oral Irrigator, WF-11

Everything about this WaterPik is great (assuming you're shopping for a countertop model vs handheld). It takes up the least amount of space both footprint-wise and vertically as compared to other WP models and other brands, so if you have a medicine cabinet hanging super low and close to your counter, this WP might still work since it's not that tall. I've included a pic to show the difference between the Ion and the WP Aquarius, with my electric toothbrush and face masks for scale. The reservoir holds plenty of water; no need to refill mid-cleaning. The charge holds for about 3 weeks. The motor is not very loud so you won't disturb others. The only bad thing about this model is that you have to be very careful taking the reservoir tank off the base to fill it with water. You have to pretend you're playing the kids' board game, Operation, and make sure the sides of the reservoir tank doesn't touch the sides of the base, otherwise, it makes that horrible nails-on-a-chalkboard noise. It's really awful. That's my only complaint and I wish the WP folks would figure out how to fix the materials so that horrible noise doesn't happen.