I've tried just about every single flossing product on the market to include the very high end vibrating flossers from name brands. The problem with the high-end flossers was that they required charging as well as expensive refills. The problem with all the other low end mechanical flossers I tried was that they were not ergonomic, or the floss was round and did not fit between my tight teeth.When I saw this, I thought there could definitely be some potential based on the fact that it uses a flat floss. At first, it's a little awkward to use, as you have to get a feel for advancing the floss, as well as tightening it. But once you've used it for a little while, you can move quite a bit faster. Using this is a constant process of flossing, advancing floss, and then tightening the floss on the reel.It doesn't take as long as it might sound, but it definitely takes getting used to.So what's good about it? The floss is flat, which helps with access and comfort, and the refills are very inexpensive and go a very long way. Additionally, this is much more small and compact and can easily be thrown into a travel hygiene kit. The ergonomics are great for getting even back into wisdom teeth once you get a feel for it.There are some downsides. For starters, it's necessary to wash away the gunk from your teeth that's on the floss, in order to advance it into the waste spool. Second and biggest downside to this is that sometimes I've had the floss break due to my teeth being tight and somewhat sharp. As a result, it's necessary to unwind or cut the thread on the spool, and then rethread it. Definitely the most annoying aspect of this, maybe something that can be solved with slightly stronger floss. The ergonomics of advancing and tightening the spool aren't the best, but you do get used to it.Overall, for the few pitfalls. This has it is, by far, my favorite fosser, that I've tried...out of many. I'm just shocked that I'm the first one to review this, as I think this is a gem of a product .