Well after a few months with the amp I am still enjoying it a lot. I have added a D90 DAC to my setup in addition to my Yggy. The Yggy feeds the LTA via balanced input and the D90 via the single ended input. I changed the preamp tubes (12AU7) and the 12AT7 tubes to NOS tubes ( Radiotechnique and Mullard) from Upscale Audio, and the new tubes have settled in nicely. I am still using the LO output jack to drive all my non-estat headphones. I have just added a ZMF Verite Closed to my collection (arrived today! ) and they sound amazing from this amp. The ZMF Auteurs also sound excellent, as do the Dan Clark Ether 2's.
I still love the ability to move between headphones, electrostatic headphones and speakers. It is very versatile in that regard. I bought a relatively inexpensive set of Martin Logan bookshelf speakers to have on my desk and can switch to those if I want a break from headphones, or to share something like a video with more than one person.
The amp is more engaging that my solid state Monoprice THX-887 - so if I find myself gravitating to the LTA more. The Monoprice is a great amp, and has top notch measurements but the LTA pulls you into the music more.
If the LTA has one down side for me, it is that I do not think it pairs well with my Voce, either with the original tubes or the NOS tubes. I have not changed the 4 EL-84s yet, so maybe that would make a difference. My Mjolnir Audio Carbon seems to drive the Voce much better than the LTA. On the SR-009 the LTA does a good job of driving them, and for the things people call out as strengths to the SR-009, like classical, jazz, or guitar they sound great on either amp. The Stereophile review loved the Z10e with the Voce's - so still a little baffled here.
After living with the amp past the honeymoon period - I can say I still love the aesthetics of the display. The volume knob feels awesome and the little clicks it makes are cool. I use both the volume knob and the Apple remote. I did not think I would even use the remote... I mean the amp is right over there, just reach over and turn the knob... but I do. It is really nice when you want to sit a bit further away - for me that is a 9' or 10' cable and sitting in my reading chair. Sometimes a song needs a little more or a little less volume and the remote is great for that when you are all settled in. I have the extension cable for the SR-009 that I can add and again sit in my reading chair across the room or at my desk.
One thing I find is sometimes the volume is a bit variable, meaning that when the amp is warming up it is loud enough on 8, but then I like it on 12, or 15, or 18. I would say on the other amps with an traditional potentiometer I am always in a repeatable range - low is 9 o clock, jamming is 11 to 1. Not a big deal, just something I have noticed.
The amp remembers the volume settings between inputs - important as the balanced input has a higher voltage so is louder. If I am listening to the Yggy at 12, I might be at 25 on the D90 (single ended).
On the single ended input, using the LO jack I don't think I have been over 45 on any of my headphones - the LTA goes to 100, so it has had plenty of power to drive the headphones I have. I would love to try a hard to drive headphone like a Susvara on the HI jack someday.
Something else to note, and I think it has been called out before, is that there is a headphone/speaker selector switch on the front, but the electrostatic jack is always live, so if you have your electrostatic headphones plugged in, you will be driving them. So you would want to be sure you don't turn up something else ( speakers as an example ) and forget you have them plugged in. I usually unplug them when I am finished listening.
I wish I had owned, or auditioned a lot more tube amps like the Woo line up or the BHSE - then I could give you a better or worse comparison, but I haven't. I knew I did not have room for a BHSE and a Woo amp, let alone something else to drive some small speakers so this amp fills a unique spot with being able to do it all. Being OTL is also a cool aspect of the design, I can switch between something like the ZMF headphones and the Ether 2's without worrying about impedance.
Plus it's design is elegant - It gets warm, but not crazy hot. I have had it on for hours at a time and can the most it gets is slightly warm on top. It does not use a ton of tubes ( 10 total ) , and while I am a tube newbie, it seems like you can get a wide variety of NOS tubes if you want to try something different. Of course on both the Woo and the BHSE you have more visibility of the tubes themselves.