If you just do street driving, and haven't radically modified your car, it's a waste of money IMO.
The Fluidyne is very well made, and it's 100% metal (vs. the stock radiator with plastic end tanks). The Fluidyne has a larger capacity so it will take longer for it to heat soak, and it
should provide better cooling. Mine was very very nice. Too bad I never installed it.
It's a good idea if you race (road race, not drag race) or have any type of FI mod.
If you have an auto Prelude, keep in mind that the Fluidyne does not have provisions for the tranny cooler. You will have to buy a separate cooler for that.