Just realize that because you have a whole row to yourself does not mean you also have the overheads over them to yourself it does not work that way. I can't imagine what would happen if everyone brought a bag that size as a carry on, that is in fact the size of a second suitcase in a normal luggage set of three which is 30" pulman, 26" standard and 22" carry on. That is normally considered a checked bag.
I must say I am tempted to take mine that size because it means I could take one carry on and not two but I am afraid it might get gate checked and I don't want to deal with that, I already will be having my electric wheelchair gate checked.