Hey Dan I just checked there website as well and it’s showing the 28’ grade 1A fiberglass ladder is 64lbs and the aluminum 28’ grade 1A is 56lbs = 8lbs difference. I thought it would be even more then that. Also considering guys tend to move ladders a few feet completely open or at least I use to, those few lbs add up if you use the ladder enough. Heck I remember years ago moving the 32’ fiberglass ladder fully open a few feet alot but I was in much better shape then.
My biggest fear back then was hitting an electrical line by mistake which is why I bought those Fiberglass ladders. Also because I use to clean with minimal chemicals when I started until I found these boards and learned a ton. Today we hardly ever use the ladders unless a specific type job calls for them.
If your a strong dude with a great back and electrical is a concern in here then Fiberglass is the better way to. Besides that I would invest in aluminum Werner ladders today.