I saw those. They were the same price as from Russia (and the post from the Ukraine is likely more reliable) the only dependency being the DOM differences. But I think they should still be quite close in spec. I think that's it for rolling. I don't think there are any more drop-ins.
When I biased the 6S15P to 145V (they were off by about -20V) then the differences between them and the EH tubes got smaller and it cleaned up a great deal. But the properties that Jaime lays out are pretty much still there. I find it slightly less mid centric and more holophonic. I'm a sucker for the holophonics. Improved guitars/strings/space and slightly more punch in the bass are all welcome. Male vocals are a bit less emphasised but pretty much everything else is kicked up a notch.
This is just comes from a quick listen before they've fully settled in. The impression of the difference was somewhat obvious after a swap, and then has lessened after biasing and continued listening as audio memory of the EH fades. Huge difference in audiophile terms. Reality? We're not so sure. :)