This is sold by Trader Joe's, though not under the store's own brand name. It showed up last week on the "new products" shelf of the Asheville store.
I liked this more than I like most such products (i.e., carbonated but unsweetened beverages). There's not much real grapefruit juice here--just that from 3/16 of one grapefruit, if the claim on the box is to be believed. But it seems to make a real difference in the flavor, while adding only 15 calories to each 12-ounce can. The taste is, as you might guess, like diluted, fizzy, grapefruit juice.
It's not as good as real grapefruit juice, of course, but for a light, bubbly summer refresher, it'll do nicely.
Will I buy it again?
Probably not. But I'd be happy to drink it if it were offered at a party or somebody's house. It might make a nice mixer, too.
Update: I wrote that after having just one of them. I gave one to Nina, and drank the last two over the next couple of days. I liked each one better than the last, and will now change my final verdict on the "buy it again" question to yes. It's on my list for a repeat purchase next trip to TJ's.
It should come as no surprise that I liked this. It's not sweet. It tastes grapefruity, but very lightly so—and with a nice back-of-the-tongue bitterness brought to you probably by some grapefruit oil. Very refreshing.
As a mixer, I think it would all but disappear, as the flavoring is very low-key. It makes a great summertime non-alcoholic sipper.