No, not me.
I really like Tungsten, tho. In general (and in saying this I don't mean to criticize all the brave souls who roll their own, on the contrary I applaud them) it seems to me that custom themes are made to fit the creator's needs and workflows or are more experimental; stunning to look at but fatiguing to work in after the WOW factor wears off. Tried a few, always went back.
I also think that opening part of the architecture of the program to customization might slow down the evolution of Sonar.
Example: The new trend is to have the mix window with channel strips in vector graphics. It's a great feature that really makes a difference in workflow (resizable, repositionable, etc..) and I happen to think that Sonar could benefit from it.
Now, let's assume Cakewalk wants to update the mixer window. What's someone who spent hours customizing their own channel strip to say? Probably they wouldn't be happy because the hours they put into creating their own GUI are useless now.
What would you do, go ahead and upset them or respect those users and not evolve?
Then again, many people are perfectly happy with the custom themes and the mixer window; this is just my personal opinion, respectfully expressed.