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

I have never heard a Pass amp.  But I wish someone would come up with some serious weak points so I won't feel I absolutely have to have a XA25.

A friend owned Pass gear. Sounded great with his system. He passed away; so much I miss him and his love for audio.

Celander, sorry to hear about your friend.

They are not expensive compared to Gryphon, FM Acoustics and other Swiss brands, or even some Japanese, I guess.
Yeah, those lights would bother me, that's BS. Big and heavy, all good amps are big and heavy and inefficient.
Not enough top end resolution and energy - now this is a weaker point.
Being on a slightly warm side of neutral is a strong point for me. Redgum amp that I have is exactly that, good balance.

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...