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
Sorry, @wolf_garcia, but the XA25 is the best amp I've used in my system. I've used: CJ MF2550SE, ET250S, Musical Fidelity SS.

What I love about the XA25 is that I get >wonderful midrange from the CJs with most of the bass slam of the MF SS. The XA25 has the best soundstage of all from my Sophia 3s.

But no, no real downside to the XA25 except that it doesn't have the bass authority that I've heard from other amps.

Well, another downside is that my other amps only get used in my office system or are in the closet waiting for adoption to a happy home.
Well you asked so here is my opinion. I owned for quite a while the Pass X350.5 amp and the XP-10 preamp.

The XP-10 preamp to me was average. The step up from it was the XP-20 which has 2 separate chassis, I never heard this unit but I didn't like having to use extra rack space for the units.

I compared directly the Pass X-350.5 to the newer XP-350.8. I just did not like the newer X350.8. To me it sounded much more closed in and had less treble presentation than the older 350.5. Caution either chassis gets very hot! 

Eventually, I tried an Atmosphere M-60 3.3 and sold the Pass. Today, I own the Bob Carver Raven 350 tube amps.

Each step improved my audio enjoyment as I moved away from Pass.

ozzy
Jetter, I own an XA25. It’s cheap in that it punchers wY over the specs and is brilliant.  I also own their pre XP-22.  Have had XP10 as well. Very good equipment.  There is nothing bad here.  I came from mostly Reference level CJ TUBE equipment.  
Well thanks medwardo and jahatl, you have both convinced me that the XA25 is not worth the investment.  Well that's totally not true, and in time I feel I will be purchasing one, but not for a little while yet.  Enjoy the Pass, and its all fun.  
George
Since you are interested in the difference between XA and X, call Kent English at Pass.  5308785350

I have the XP-12 which can turn on the XA60.8. The Ayre preamp couldn't. I needed that functionality.

Wayne, the designer of the preamps told me that the XP-10 cannot turn on the XA60.8. 

The combo is good to my untrained ears.