Jason has been pretty clear multiple times about the microphonics of these tubes, and it is reflected right on main product page for the Valli.
"When you plug in headphones, you'll hear a little "tiiinnnnggg...." noise that takes quite a while to go away. If you rap the chassis, it will do the same thing. "
Again on the FAQ page:
"Two, many tubes, including the ones in Vali, are microphonic. When you plug in headphones on Vali, you'll hear a little "tiiinnnnggg...." noise that takes quite a while to go away. If you rap the chassis, it will do the same thing. If you work on, say, a paint shaker table, Vali's not going to be the best amp for you. "
And again, in the manual:
"Tap on Vali when it’s running and you will probably hear a ringing sound. This is because tubes are microphonic. The solution? Don’t tap on it. Tubes are also usually noiser than solid state amps. For some people, these oddities are part of the charm. If you want certainty, stick to solid state—return the Vali and go for Magni instead."
It doesn't mean the tubes aren't being matched the best that they can be - whether or not they are matched on specs has nothing to do with them being microphonic or one more microphonic than the other.
(Some interesting reading here about microphonics, for anyone who'd like to learn more: http://www.thevalvepage.com/valvetek/microph/microph.htm )
Based on everything Schiit and Jason have said, it should be expected that they will be microphonic - so it really makes no sense that anyone would be surprised by it, complain about it, think the amps don't perform as well as the samples, etc. Schiit has been as completely up-front as they can be about the tubes used and what they are/aren't. What they've done is produced a very nice little tube amp at an even nicer price.
To me, the reports in this thread don't in any way point to the Vali not living up to the samples, but do point to everyone hearing things in their own way (like they do with every product that gets dissected here on Head-Fi). Some people love it, some people merely like it, others not so much. Purrin may hear it as an amp that bests everything up to (a rather specific) $1600, someone else may hear it and think it's just ok, or even the worst thing they've ever heard. They're all absolutely correct - for their own ears, their own gear, their own tastes in sound.