During its brief run, O'Neil adapted four of Leiber's short stories ("The Price of Pain Ease," "Thieves' House," "The Cloud of Hate," and "The Sunken Land") and wrote one original tale of the Twain, which appears in issue #3. Interestingly, Chaykin would himself adapt several Nehwon stories for Dark Horse Comics in 2007, this time with Mike Mignola and Al Williamson providing the artwork.
I'd never seen any of these until fairly recently, since I was quite young when they originally appeared. Overall, they're not bad, roughly comparable to the adaptations you'd see in Marvel's Conan the Barbarian, which predated it by a three years. Indeed, it's quite likely that Sword of Sorcery was part of an attempt by DC to take advantage of the growing popularity of not just Conan, but fantasy stories in general.
The more one delves into the popular culture of the late 1960s and early 1970s, the more sense the appearance of Dungeons & Dragons at that precise time makes. There was definitely something in the air at the time.