Reading the fine print, you have to have special magnetic inserts for the thing to work and, apparently, they've only got 'em for aluminum arrows. Seems like having a rest only for aluminum in this day and age with the carbon fixation would be a deal killer.

Not to mention, for the inserts to be magnetic, they'd have to contain a good bit of iron or steel. That'd add a good bit of weight to the arrow, also a deal killer for the speed freak contingent.

Did anybody but me notice how beat up the inside of that rest in the video was? There's obviously been a LOT of contact going on inside that booger!