Anyone know how well this works? I'm thinking of getting fatboy done - I'm too aware that he looks the same as every other grey section A so I'd never stand a chance of getting him back if he was stolen (though they'd have to be mad!). Remember hearing somewhere that it doesn't show up well on greys, but I'm reluctant to microchip as I've never seen horses scanned at sales, plus I'm told you can remove them fairly easily.