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I havent heard the 510 yet,but the bigger brothers are incredible and make most speakers from their price range sound muddy and disjointed(slightly less so with the partnering sub,but it is a must-have even for the 712).
Speakers are physical engineering and while you make some useful savings from making a lot of them, some of the materials and engineering in these are never going to be cheap. The smaller members do make stunning AV speakers though.