Funny you ask that. I have been toying with the idea of building a switching audio amp but there are a few problems - mostly harmonic ones (obviously). I am assuming you mean Boulder or Tact (I suppose there are a few more now) and I would say in general that the linear amp would be better just because it is very well-known technology. Switching amps will come soon as I am sure there are plenty of well qualified people working on it night and day. I don't know that I would get one just yet however. just MHO.
