Every loudspeaker, no matter the price, is voiced by the builder to best accomplish their design goals. That's why there's no unanimity of opinion of the best speaker at any given price range, including unlimited. Harbeth, like many brands, has been around for a long time. You can trust them to build a quality product at a just price.
That doesn't mean they're for you. Every buyer is seeking the speaker in their price range that best meets their own personal "voicing" standards.
Don't look at this as being something special that Agon is offering you. It's just a sales ad. If Harbeth wasn't on your radar before, you don't need to add them now.