Let's talk about them.
I've found that they offer the best qualities of both EL34s and 6L6s, to my ears at any rate.
Any other opinions regarding these tubes?
Their immense headroom is beautiful and simultaneously frustrating at the same time. I found with the amps that have used them, they don't have that little bit of break up that EL34s have to make things stand out a little more. Not everyone likes that though so it's not always needed.
They sure as hell make cleans great though, a huge amount of volume before any form of breakup kicks in, that I am a tiny bit jealous of