Icarus Cadence Magnets????

Just stumbled across the above cadence magnets on EBAY for use with Garmin's, Cateye's etc.
Seems like a good idea in principle but I could not find much info on them and they all seem to be supplied from the US at present.
Has anyone given them a go and if so how do you rate them?
Seems like a good idea in principle but I could not find much info on them and they all seem to be supplied from the US at present.
Has anyone given them a go and if so how do you rate them?
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I'd just order something like these - http://www.ebay.co.uk/sch/i.html?_trksi ... &_from=R40
Neodymium magnets - much cheaper and faster delivery - plus - great for fridges.
Just look for Neodymium Magnet on ebay. These are rare earth magnets.
http://www.ebay.co.uk/itm/20pcs-12mm-x-3mm-Disc-Rare-Earth-Neodymium-strong-fridge-Magnets-N35-12x3mm-/261108006108?pt=LH_DefaultDomain_3&hash=item3ccb3ffcdc
For example
Many thanks.