I enjoyed the review!
I also own the STA-200 which is a great amp (at the discounted price) however as stated in the review problematic for the high gain. A candidate for a passive pre. which I use with it in a secondary system.
After selling my BEL 1001 MK5 (a poor decision on my part) I purchased a Pass XA25. Still getting to know this one. It is in rotation with an Aric Audio Transcend tube amp. Driving Tannoy Sterlings. As you state with the J2, the Pass can go loud and remain clear as day. Must say I enjoy having both amps. They both deeply involve me in the music.
Not much for writing reviews, my hearing is mine alone, would not impose that on anyone :-).