HED's are a smoking deal for what they are. Or used Flo's if you want modern "wide" aero wheels on a good budget.
Owning a set now that's 25mm outside width, I'd never see a purpose for anything wider for road use. Unless doing Roubaix or putting them on a mixed surface bike.
Road only? I think 25mm outside gets the balance of crr, aero, profile just about right. Toss a 23 on the front for a TT or something, otherwise a 25. Really fast.