My experience is similar to rlb61. The 6H30 implementation that I've heard/owned in various preamps much too close to a transistor in terms of sound to justify the downsides of tube ownership, at least for me.
I got tired of worrying about putting hours on the tubes, etc.
The 6H30 certainly is in vogue however and there are many who love them, I simply wasn't one of them. I guess I'm just a SS guy when it comes down to it.