Linear Tube Audio- Any feedback on their amps/ Preamp?

I want to get to RMAF or CAF this year. Since I already have an LTA system, guess RMAF would be fine since all I’ll be buying is music :). Still would like to meet the LTA folks at CAF and tell them thank you personally. 

I was set on a Naim Nait 2 and was comparing some Proac Tablette 10s to my old Harbeth P3esr speakers. For grins, hooked up the ZOTL 10 to my Sennheiser’s  HDV 820 pre outs with the P3s playing. Wow!  Doesn’t go loud but I sit nearfield. Still curious about a Pass Labs XA-25 and the HPA-1 but this simple setup sounds incredible. It was like going from hi end to something world class. 

I'm using the mz2 with a Pass xa30.8, and the synergy is pretty special.  From what I've been reading, the XA-25 may even be better, so I'd say you can't go wrong.  I would like to know what tube rollers are using in the MZ2 to better the stock tubes.  Any suggestions welcome.

Terry London from hometheaterreview.com seems to really like the Micro-ZOTL with the XA-25. So did teajay here at Audiogon. List goes on...

Jack from theaudiobeatnik.com reviewed the XA-25 with the MZ2-S but seemed to like the HPA-1 best. " The two Pass Labs products had a very nice synergy. "  I just wonder what tubes Jack used and if things could have gotten better.  I'm running my HD-800S headphones balanced with the HDV820 and worry what kind of of performance hit I'll take moving to single ended.

Then there is the MZ2-S & ZOTL 10 combo that Herb Reichert and Rafe Arnott loved at RMAF 2017... I should have just stuck with the combo. Didn't because of a speaker mismatch. Maybe I'll just get another. MZ2-S with the LPS+ but the Pass Labs combo also intrigues me.

I'm using all Gold Lions in my ZOTL 10 and put Gold Lions in my MicroZOTL2.0 before I sold it to my friend. My 6SN7s were the Tung-Sol 6SN7 GTB 1 Pair Reissue that I believe came stock. I just didn't want to mess with NOS tubes as I've had bad luck with the ones I purchased being microphonic.

Think I'll try to find an XA-25 eventually just to compare. I'll borrow my old MZ2 when the time comes.

Still waiting for the ultralinear.