Wes,
I've not heard any scuttle-butt about an inherent problem with Fluidyne radiators leaking. The cores are furnace brazed & the tanks TIG welded, as far as I know (I'm not running a Fluidyne radiator). They shouldn't be prone to leakage. Properly installed & maintained, the aluminum radiator should last a long time.
A radiator must be rubber mounted, so the car can flex without flexing the radiator. You should also run 50% coolant that is compatible with aluminum & 50% DISTILLED water. Never use tap water. Reverse osmosis water is good too. A corrosion preventative like RedLine Water Wetter or RM25 is a good idea as well.
A good radiator shop can repair leaks, even in aluminum radiators. However, if the radiator has been installed properly, and you're running acceptable coolant, I would be inclined to give Fluidyne a phone call and ask about their warrantee.
best of luck, George