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Is that one Low ESR though (whatever that means!?)
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I'm not sure whether those particular caps are low-ESR, but it's more of a preference than a necessity, so I just linked to those as I didn't have time to find some low-ESR jobbies - sorry! Low-ESR caps will help your ESC run cooler than non-low-ESR caps as they'll be slightly more effective at smoothing out voltage ripples (less resistance, so the cap will absorb/release more voltage when it's needed). Northy's right with the definition there.
But yup, ideally you want low-ESR caps; especially if you're running a demanding setup (higher current draw means more voltage ripple from the cells). If you're not running a particularly hot motor though, it doesn't *need* to be low-ESR.