Hi Mofojo,
Yes, such as Pass Labs XA-60.8 mono-blocks/Accuphase-450 and it brought its special magic to these SS amplifiers. When I was taking it around for people to hear it in their systems there were both tubed and SS based, the owners all agreed that it was superlative and better then their pre-amps, regardless of price. I believe it sounds very different, more like real music, because of David Berning's ZOTL design, and it brings this to any system its placed in.
I have reviewed both Backert Labs pieces and have listened to the Coincident SLS, all three are great performers. However, they don't do color, space, and dynamics the way the LTA does.
I would be very interested in what Charlies, because of respect for his ears, take would be on the comparing his SLS with the Micro-ZOTL in his system