In my experience they are definitely a little wider than other shoes on the 5 Last. I usually wear a EE on the 5 Last, but with these I got single E and they fit wonderfully.
I'm torn though in giving advice because they're not quite a full size bigger. It's not like buying a shoe on Alden's Barrie last. I believe your normal size could work out.
Regarding maintenance, I haven't ever polished them; I usually just wipe them down at the end of the day, brush them, and then brush them up again before wearing again.
I think they are very versatile shoes in this color. Dedinitely recommend cognac over say, the distressed brown currently on clearance.