Anyone have experience with ElectroHarmonix tubes?

I just bought four 6922 ElectroHarmonix tubes for my CJ LS17 preamp and they sound pretty good. Not as good as some NOS tubes that I have used but certainly better than Sovteks. There are not as hard or cold sounding as Sovteks. Anyone else out there ever try these? I think that I could live with these if I could no longer get my hands on NOS tubes or could no longer afford them.