Two comments on this perk:
1) I love that Red Bull sent a four-pack of full sized product instead of coupons, other types of discounts or sample size. If a brand is going to tell someone they are special, doing so with a %15 off coupon just doesn’t cut it.
2) This is the first perk that I’ve received (I think) that wasn’t Klout branded. The note mentions Klout but doesn’t come with the standard note from Klout founder, Joe Fernandez. Not good or bad, just an observation.