First off, it needs to be said that Robert E. Howard and Frank Frazetta are the perfect combination, and this book is overflowing with Frazetta illustrations, which is fantastic.
The problem with this book? It's a collection of Howard, all right, but it's not necessarily the best of Howard. And while you get all those amazing Frazetta drawings (and a couple of paintings) they're not necessarily intended for the stories they're paired with. Some of them are pretty close - there are only so many themes in each of these guys' work - so you'll read about a viking and sure enough, there's a Frazetta drawing of a dude with an axe. But often they completely don't fit. It's just a great drawing with little connection to what you're reading.
But I was generally okay with that. My biggest issue with The Ultimate Triumph is the quality of the stories chosen. There's one Conan and then a handful of historical and barbarian stories, most of which are from early in his career. They're pure Howard, full of manly men in combat, but they're not great.
If you love Frazetta and really, really love Howard, then this book is for you. Otherwise, find a better sampling of Howard's work.