Reference 3A MM de Capo Be - how do they sound?

For those who have, or have auditioned these bookshelf speakers, how do they sound?  Is there a more mainstream bookshelf loudspeaker that you to which you would compare them? If you own them, what amp(s) do you think they best perform with?

There is a new version available, the MM de Capo Be II, and I am very interested. Reference 3A offers a 3 week trial period, but I read that they take a bit of time to fulling break in, so I’d prefer to know more about them before I make my decision. Thanks in advance.