Reviewers split Instafloss into two stories: early units drew sharp complaints about years-long delays, leaking, loose mouthpieces, water spraying everywhere, weak cleaning for some, and poor return experiences, while many later-batch backers say those flaws were fixed. Positive reviews repeatedly praise speed, ease, strong cleaning, and the fact that it made them floss more consistently, with several citing better dental checkups or cleaner-feeling teeth. Customer support is often described as responsive, but even satisfied users note a learning curve, noise, size, and occasional limits on very tight teeth.