95_Mystique, Royal Purple is a very highly regarded oil. You certainly can't go wrong using it, but as to whether it's "worth it", only you can decide.
Any quality synthetic oil such as Mobil 1, Pennzoil Platinum, Castrol Syntec, Valvoline Synpower, Royal Purple, etc. will provide superior service. Using a synthetic oil in the engine and a synthetic fluid in the transaxle has been shown to give a very slight improvement in MPG.
If you drive in a very "spirited" manner, live in a very hot or very cold climate, do a lot of towning, or want to extend your service intervals, then synthetic fluids are beneficial. If you do none of these things, then they really are overkill. What's more important is that the oil be the correct viscosity for the engine, and that the fluids all be changed at intervals appropriate for the use the vehicle gets.