When I bought the first pair, it was only available with the VT-40.2. I sold mine here on Audioholics.
I'm a little OCD, and couldn't stand the idea that the SQ was steadily declining as the tubes wear out and there is no definitive point at which to replace them. The perfectionist in me and 'me Scots blood' were at war! lol.
Obviously it isn't a big deal for most people!