Looks like an interesting design, and they appear to have a good selection of testimonials. The "Baby Bubbles" look particularly cool!
They're not cheap though, and the occasional anchorer may be better served with a less expensive conventional design.
I'm surprised to see that their recommended length of chain is as little as 6ft. If this is really all that is required then there could be a bit of an overall weight saving.
PS Keith, here's an H for you