What are the weak points of Pass amps and pre-amps ?


Though there are perhaps better transistor amps, but Pass seems to be an excellent choice for many.
What is your experience with them, if you could elaborate ? Integrateds as well.
inna
I prefer the X series, though have not heard the top of the line XA...my dealer said many prefer the X to the XA at given price point...
When I told dealer I liked clean clear accurate dynamic sound he said try the X250,8. And that was my favorite over similar price XA and X350.8