i agree.when i restored my 85 4runner,i used fiberglass quarters from the same company.i wished i had gone with steel.
Care to explain, from what i have seen these fiberglass fenders are very strong and look very good (body lines matching etc...), did you have issues with yours? I've been wanting to go the fiberglass route as well, instead of dents it gets cracks and is easier/cheaper to repair and obviously will never rust. Curious to know why you regret it.