It's not fair to compare the 12 to this, but the higher 46% ABV is immediately picked up by the nose: lemon cookies awash in a wave of alcohol. The palate is oily and mouth-coating with butter cookies, and notes of nut butter underneath it all. (Thanks to JCStylz for the dead-on tasting notes.) Characters of red, and citrus, fruits also accentuate the palate, before the wood spice makes it's appearance. A subsequent nosing highlights the butter cookie note. With the finish closing in, I start smacking my lips and that's when the slight oak bitterness is detected. That eventually mellows into a lightly sweet aftertaste. Enough! Time for another sip! This is definitely a step up from the 12, introducing a deeper flavor profile. Is it worth the $30 USD hike in price? It depends on what your drinking mood is about. If you want something of good quality and simple - a movie glass - the Redbreast 12 checks off those boxes. However, if you want to enjoy a dram with a degree of complexity, without having to work too hard, the Redbreast 15 is the right choice. (I am eager to see how it develops with air, as the bottle goes down.) Of the half-dozen Irish whiskies I've tried thus far, this one takes the cake. My Rating Glossary: Two Stars: "I'd rather be drinking lite beer." Two 1/2 Stars: "Posh rubbish." Three Stars: "I love whisk(e)y. This is average love." Three 1/2 Stars: "May buy again." Four Stars: "I've got to get you into my life." Four 1/2 Stars: "Better than drugs." Five Stars: "Life is good. Whisky makes it better."