I got this as a Christmas gift in 2015. I have used it a handful of times, but I really can't discern a taste difference. It is mostly something that was just a fund thing to try. I wouldn't personally recommend unless you are really knowledgeable on the subtle of wine flavors.
Everyone says it's a gimmick and it might be so but I swear I can taste a subtle difference. It might all be in my head as I'm not a wine connoisseur by any means. Still, that gurgle sound the aerater makes when the wine goes through convinces me it's doing something.