I have the Michael Kors Hamilton in tan - similar dimensions to the one you link to, although a bit less height on it.
I love it. I can carry an A4 notebook, plus phone, kindle, change of shoes, make up, snack and water bottle in it, or a whole change of kids clothes, snacks and books etc. depending on what I'm doing.
I have used it maybe 4-5 times per week since I got it last Christmas and the leather has barely aged at all. It just seems really robust. In fact, a couple of days ago the lid came off my daughter's prune juice in there. I thought the bag would be ruined, but the inside seems to be made of some amazing liquid repellent fabric so nothing soaked in and the juice just tipped out. I just rinsed it with water, left it to air dry and it was as good as new.
I would never have bought it for myself (DH bought it as my Christmas present) but I love it now I have it. Of course, this doesn't mean the others wouldn't wear well, but I am really impressed with it and would consider buying a MK bag again having never considered spending so much money on a bag before.