Swapping W4S to Pass Labs XA- worth it?

The numbers I tossed out there are what Pass Labs published on their website for XA30.8. I'm just talking from the experience of having built a Pass F5 and used it with not wildly dissimilar speakers. When I had that thing biased at 1.1 amp it clipped and it didn't sound it's best. It sounded hard and brittle. But I listen kinda loud. The thing has always sounded very good compared to lots of other amps. I'm just saying I'd be cautious. Take it or leave it. 

Hello Michealkuz, 
Congratulations on getting this amplifier and I believe that you'll be very happy with your decision.  Given your (stereo) listening volume habits and music genre  I doubt  you'll use more than a few watts (the majority of your listeniing) and will rarely move out of class A operation. Let us know your listening impressions. 
Charles

OK, as I promised - reporting on Pass XA30.5.
Listened to it for more then 2 weeks now
It is definitely better, then W4S. The difference is not "night and day", definitely not like AYON CD-5 vs OPPO-105. That was night and day, with Ayon blowing me really out of the water. This is more like "night and dusk" so to speak.
I am not reviewer and cannot describe all in audiophile terminology, but sound is more "natural" for my ears, and more detailed at the same time. Especially on small classical quartets, music I heard live very often - cello is spot on, which I never was able to achieve in my system for years.
Imaging is actually very close call - may be W4S ST500 II amp is pretty good indeed, as some other people say. It is just not Pass Labs.
With my GoldenEar Triton 1 needle on a meter almost never moves. I have to crank sound to level I feel uncomfortable to see it start to move slightly.
Two additional observations -
1. I can hear more details with lower volume then before, surprise.
2. In HT settings (I recalibrated system due to different amp gains, I use Anthem 720MX as a processor) and for 5.1 recording sound improved quite a bit, more then I expected. the whole presentation became way more organic, and I gave my collection of awesome Steve Wilson classical prog remixes a new spin. Dunno if it is amp or recalibration or both.

At the end I would like to thank everyone who participated in this thread and pushed me into decision to switch amps - money well spent.