Michael wrote:
"Anchor weights, (also known as chums, kellets, sentinels, anchor
angels) have been used for generations to anchor boats more securely.
They almost double the holding power of the anchor and reduce the
working load of the anchor by up to 50%. They are an advanced
technique in safe, secure anchoring."

"The secret is to have it off the seabed at all stages of the tide."

"All chain anchoring....Trailer boats, power or sail .How it is
attached .Anchoring techniques
.How catenary affects anchor holding..Have a look at the video .See
demonstrations at boatshows "

URL:

http://www.anchorbuddy.co.nz/

Any thoughts?

A handy gadget to have, but not a necessity. It is useful if you find
yourself anchoring in limited scope situations. However, I wouldn't
feel happy relying on one in high winds since its advantage goes away
when the rode is stretched tight.