Two issues with Grady's, though I/O's have a certain degree of advantage they are still effected.
1. Pre-88 hulls or maybe 89 I'm not 100% on the year have serious problems with the transoms and stringers, it seems that the y used staples to hold together the layers of ply type wood and they also did not seal the transoms from moisture well.
Results- staples rust out and transoms delaminate, there has been more than a few catastrophic failures on the water.
2. They pre 88-89 hulls ride like crap in a chop, will knock your fillings loose, if you have been in an old style Boston Whaler hull you will know exactly what I'm talking about. They changed the hulls in both boat lines and made a world of difference.
Don't get me wrong both of these hulls are very stable and sea worthy, but ride like crap. And thats coming from a guy who has and still does fish on them for many years, and yea I still love them but would not own one.
JMHO