I got mine in February direct from Quicksilver as they have no dealer here in Minnesota. I call it QAHA.
Love it!
Has that SET Class A magic that really heightens the perception of touch & subtlety that the musicians' styles express, the particular interpretation and technique are highlighted.
And Tube Magic, but not "Tubey Sound" which I read as excessively warm and slow. This is fast & accurate to my ears. Musically warm, but tonally neutral(ish).
I completely agree that no tube rolling is necessary to enjoy & respect its performance, but make no mistake: Tube Rolling will yield wonderful results! (It's at least half the fun of tubed gear.)
I already have on hand a very fine stash of 12AX7's, but sadly I had (past tense now...) no EL84's and it's a little late in the day to find great bargains in vintage EL84/6BQ5 's.
So I had to find some. And it would be easy to exceed the amp's reasonable cost with $$$ spent on tubes...I have done so in the past...
I have not tried changes to the output tubes yet, but have briefly done a short survey of the 12AX7's on hand (> a dozen pair). Currently I am sticking with a pair of Mazda chrome plate 12AX7's from the early 1960's which are my overall favorites to use as a default in any tubed gear that uses this tube.
Other tweaks include: Herbie's Audio Labs Ultrasonic Rx Damping Instruments - one per each of the four tubes; Nordost Pulsar Points (the original in aluminum); Nordost Blue Heaven AC Cord.
Headphones used: Sennheiser HD580, HD6XX, HD700; Focal Listen Pros, Elegia's. Cables include stock, Blue Moon Audio, Corpse Cable Gravedigger, Cardas, Nordost, and Periapt.
Source: Sony WM1A running Mr. Walkman's firmware. This amp really helped to to decide I prefer the Project Z to the Midnight/Dawn releases.
Overall this creates a desktop system of supremely good and revealing musicality. I don't have any real experience with the other available amps at this price point, but this must be a Best Buy.
I will keep this amp until the bitter end.