The topic of didge mouthpieces seems to be controversial, judging by reviews of this mouthpiece and similar products on Thomann. Some are strictly opposed to using them, but for some didge materials (such as bamboo), not using a mouthpiece can be extremely uncomfortable, so I'm personally in favor of them, when appropriate.
That said, this mouthpiece is far superior to the regular wax ones, which I've also tried. The melting point is a bit higher for this wax, which means that it retains its shape a bit better, and doesn't rub off on your lips after playing. It's a bit harder to install, but using a hair drier for a few minutes loosened it up enough to install it.
As said, it's a bit stiffer than regular wax mouthpieces, which took a bit of adjustment period to get used to. Since then, I've had much better results for the tone of my didge, so overall I'm very happy with this!