Review (3/5): Seems OK but they're copies, not WaterPik brand
The flexible tips are slightly smaller than the genuine Waterpik tips. Seems to work fine. I just hope there are no harmful adhesives or plastics used to make these cheaper versions.
The seller included a "limited time deal" where I can get a gift card for leaving a review and emailing him a snapshot. I'm not a fan of that kind of promotion and I don't want him having my email address so I won't be claiming it. I looked up whether Amazon allows such promotions and as far as I could see they do but I may have missed something.