First I heard of it was while looking for shampoo bars, so I gave it a try. Well it works, I use an electric toothbrush - sorry - but it works fine and my teeth feel really clean. The taste is very different, but not unpleasant. I accidentally used the old toothpaste and in comparison it now seemed really excessively minty. I'm carrying on with the toothsoap, so recommend you give it a go and ditch the plastic tubes.
In an effort to reduce my plastic use even more, I have been looking for toothpaste options. This toothsoap ticks all the boxes. Its very easy to use, cleans my teeth just as well as standard toothpaste. No plastic at all. Looks like it will last quite a while also.