New Pass Labs X.5 series versus previous X series

Just spoke to Peter perkins at pass today and got an update on the upcoming X600.5. The engineering prototype device has now been making music for a while.
According to Peter, the team at Pass is now auditioning what may very well be the final tweak of the design. Everyone seems to be happy about the results, but the final go-ahead to close the engineering/design phase and transition to full scale production, will come only after a final audition/approval by the company CEO.
Peter suspects that full production may be under way by the end of May 2005.
I asked specifically about audible differences with X350.5. Peter answered that while there is a lot of similarity with X350.5, the X600.5 has even greater ease, liquidity, bass control, channel separation, and overall 'sparkle'. He suggests that the difference is not due to any design change, but to the complete separate chassis implementation and the dedicated power supplies in each monoblock.

I have no doubt that the monoblocks will be a refinement of what the single chassis x.5s will offer. I did post a formal reveiw here on the GON, hope you took a look at it, so I won't go into the many virtues I shared in my reveiw of the 350.5 amp. But what I want to share is the following; A new audiofile friend and music lover came to my house to hear my system and said" Come on were are the tube amps you can't get this warmth and timbres out of a solid state amp can you?" He has the 20000.00 Lamms and Karma speakers at home ,so he knows good sound.Yes you can along with dynamics,bass control, etc. with these new Nelson Pass's x.5 babies.

TJ, not only I was impressed by the findings in your review of the X350.5, but I was equally amazed by the consistency of all the positive comments of the other users following your excellent review. Nelson must truly have created something special!

Has anyone compared the X350.5 with the Parasound Halo JC-1's, or owned both of them?
If so, how do they compare sonically?
Thanks.

I had both X250.5 and JC-1 for 3 months driving my Studio. I had such high hope for the JC-1, but shockingly the X250.5 blows it away cold out of the box. Much faster, a lot more extended high end(JC-1' weakest area) , much better defined and controlled bass. And now I moved up to the X350.5 and it is in a class by itself. A lot more authority, dynamic, body, sweetness,....... I really don't know whatelse to expect from a SS amp. I heard some people prefer this amp over the XA160.