Actually, I love the way the Heresies look. They are so ugly that they are cool and they make me smile every time I see them. As far as sound goes, it's much different than the RP and they have a soul that the new ones just don't seem to have. Which one is better is up to you. Heresies are definitely worth a listen but I wouldn't say they will blow yours away.
Sorry for misinterpretating you. Not trying to get off topic, by what do you think of the 70th anniversary limited edition Heresey?