hi bubs,
yes indeed! maggies are really good..but only for a limited type of music. light jazz, classical and all those light and mellow music are a glory when listened to at maggies. but take note that maggies are not that impressive with more aggressive and bassful music such as rock, disco, pop, etc...and yes you are right, they require more powerful amps than box speakers. your yamaha receiver may not be enought to squeeze the juice out of them. why not audition Monitor Audio, Linn Ninka, Pro Ac, Triangle...they sound as good as maggies in my opinion and they will never fail to meet your expectations given any kind of music you would want to play. cheers!