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

buy used Pass amp and pre and they will hold their value incredibly well, so not so expensive in long run...I owm X250.8 and XP-22...actually ended up spending very little on the used X250.5 and XP-20 that I traded in after owning 4/5 years...

Does everyone prefer class A Pass amps overall ? Both current and older.

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...

That's unexpected. Could you say more why you prefer X series ?

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