John,
Sorry about the spouting comment.
I reckon that this ladder would be an exception to the rule with regard to the overhang above the roof-line.
It seems to have a steady "fixing" to the roof itself.
The largest number of accidents with ladders are caused by people not having the 1:4 angle rule applied, or they stretch out from the ladder they are using instead of moving the ladder across.
Ever dodgily got back onto a ladder that is extended above the roof-line wondering if the ladder is going to move at the bottom as you transfer your wieght on to it?.
Aluminium ladders are bad for it, fibreglass ladders are only marginally better.
Then you also have to think of the spouting that (often) the ladder is resting against, PVC spouting will last about 3 seconds after placing any decent ladder against it.
Then you have a damage issue to work out with the customer.
I'd use this ladder.
{Sad story, one of the last fire calls I attended was to the house of a retired electrician, as a medical co-responder, the guy fell off the fibre-glass ladder he was using while painting his house.
The guy had the ladder up against the house and it used the 1:4 angle rule, what went wrong was, the ground was soggy and it gave way all of a sudden when the guy was up the ladder, the guy was thrown off of the ladder in the other direction and landed on his head, he died at the scene from a broken neck and internal injuries.
Had that ladder been properly seated and tied off, the guy would still be alive today.
Don't cut corners folks!.}