If you're really into Card Sleights, you're better off trying to find something like Bertram on Sleight of Hand, or Card Finesse by Jon Racherbaumer - they'll provide you with much better and interesting sleights in my opinion than Trilogy. Or, study the best sleight of hand around, and get Erdnase and Expert Card Technique.
I'd only get Trilogy for the flourishes, because the tricks aren't my style. Trilogy tricks are generally quick, flashy and flourishy. So if that's your style of performing, do that. If you're generally most interested in sleights though, there are much better sleights around that will be much more interesting to study.