We had 27 year old flip top benches showing age and sunlight deterioration.  We bought the new bench/table kits to replace the old plastic assemblies.  We were able to reuse the treated 2 by 4 lumber on the new kits.  
The assembly of the new units was easier than the old units.
I am concerned about the life of the plated steel screws in the treated wood.  I may have to replace the screws with stainless steel ones.