The biggest thng ive seen is when you have a blow out the fender goes with it and when you have to get one you have to buy 2 and you have to buy the color you want and not always redily availible. 2nd there almost double what a metal fender is .
3rd you cant stand on them ..
I've had 2 blow outs with my fiberglass fenders. No noticeable damage to the outside. There is also a step build into it on the bottom and top...I use it all the time to board the boat. They are very sturdy.
2009 Z8 -2013 250 PRO XS-Dual 10' Power Pole Blades-Humminbird 1198,1197,998-MG 109-