Here in the states 1979 hulls had the worst problems with soft spots. Some 1981's are starting to have problems but not as bad as the 79's. I have had 7 hobie 16's since 1983 (81, 86, 93, 94, 97, 99, 2000) no problems with soft spots. My step father still has my original 81. I might not walk on that one but it's 22 years old!!!! I personally haven't seen any delamination on 84 and newer 16s.

cheers
Bill