Heils...excellent for their time, but not out classed by new speaker tech. My father has the top of the line Heil (Heil Tweeter, 6" midrange and 2 x 10" woofers). We did an A/B listening session against the PBN Montana SPX (traditional dynamic speaker) and the Heils were out classed in every way.
The new Heil offerrings are the way to go. Midranges have improved greatly and can keep up with the Heil.