As in everything implementation can mean success or not. Generally speaking, Class D amps have small size and little heat relative to the power they produce. Again, generally speaking, it is difficult to produce a very refined Class D amp that can compete in the higher echelons of Audiophiledom because of of their difficulty in the mids and high end of the audio spectrum. Vandersteen uses Class D amps to drive only the lows thus eliminating the problems and taking advantage of the benefits of Class D amplification. I believe there are many Class D amps that are incorporated to drive subs.
