It's not too pricey and I want to learn more about design patterns. Is this a decent product or is my money better spent somewhere else?
One advantage, potentially anyway, is it appears to be a good-sized chunk of content and usable offline, unlike Google or Wikipedia.
yes. i bought the first version and all updates after it. i never used it directly in my code, but it was always inspiring.
i can recommend C# Design Patterns by James W. Cooper (its old but very practical). i used many of his ideas in my windows forms projects. (e.g. chain of responibility for help system etc)
i would buy both again ;-)