While I see practically no complaints from others' changing to titanium, I'd be just a little cautious, since the change will surely change the character of the highs, even if subtly. As I've said a number of times on the forum, I once tried out a different tweeter than the K-77s on my AK-4 upgraded K's, and went right back to the K-77's. I wonder if many preferred the greater detail from the other tweeters, and didn't mind the slight change in compatibility. To me, it was audible clear down to the bass, even though it was only the tweeter! I didn't go for it in the long run.
Just sayin' to be cautious.
Thank you!