My dentist recommended getting one of these and said there’s no need to pay a fortune - which with this, I didn’t. If you’ve never used one before (like me!) it does take a bit of getting used to (be prepared to soak yourself and the entire bathroom!), but once you do, it’s so much better than conventional flossing. What I liked about the AUiEi is that it has 5 modes, including a child one and a Soft mode for beginners. It has a built in 2 min timer, but tbh the water vessel usually runs out first. It’s easy to operate, select mode and change the nozzles (some reviews said this was difficult and they’d broken nozzles in trying to remove them - I can only think they hadn’t noticed the small release button on the back). 4 nozzles are supplied inc an orthodontic one for braces etc. There’s two standard ones meaning 2 people can use the same unit. Instruction are good too. I’ve been using it once a day for about a month and haven’t had to recharge yet. Seems a well made and durable unit but only time will tell on that. It’s also reasonably priced. All in all I would definitely recommend.