At some stage I was interested out of curiousity, but since then I have heard some Valve pre-amps and power amps in direct comparison to me own pre-amp and power amps(switch-mode both

), but I could not hear enough of a difference to warrant the expense.
I am not saying that Valve jobs don't sound good, they do, but just not so good that I would aspire to get into the Valve game

The only real attraction they still have to me is the lovely retro look glowing in the night.