I know there are others on this thread with a TON more experience with them that will likely weigh in as well, but I did purchase one of the WE396A tubes a few weeks ago, and like you, find it to be an extremely detailed and neutral tube for sure. I must say, and I did a few pages back, that the 7N7 tubes (Frankentube specifically) I purchased on bcowen's recommendation is (to me) otherworldly!
The option (with appropriate adapters) to try the 6SN7 tubes and single octel tubes in tandem is SUCH a neat way to keep the music interesting and fresh - I am really glad I picked up my Vali!
Cheers,
Kev