@vthokie83 - for sure, thanks for asking!
I put in an order for a LTA MicroZOTL a month ago and it should arrive on Monday.
In the meantime, I found a really nice used Aric Audio Super 6SN7 at a good price on USAM (the seller was moving up to the Motherlode XL as he wanted XLR connections) so I bought that. I've had some nice correspondence with Aric since then - and yep, what a great guy!!
The stock tubes were holding it back though, so I ordered some upgraded 6SN7's from Brent Jessee, and it sounded great with those until one of the tubes started making noises from my speaker that were like gunshots, and I'm exchanging those.
I'll likely keep the MicroZOTL as well - I can 'roll' preamps depending on the music and might be able to replace some of my tube headphone amps with the MicroZOTL.
I was considering the Backert Labs Rhumba Extreme, but with its higher price than the others, I think I'll stick with these two.