The only other "titanium" string I am familiar with are the D'Addario T-2s. I'm just guessing here but they sound like the same thing.........
The clues are:
1.) The D'Addarios are titanium ("T-2" stands for "Titanium Trebles")
2.) The T-2s have a very subtle purple tint to them.
3.) The Roosebeck are the exact same diameters of the T-2s.
So, to answer your question, if you like D'Addario T-2s, my guess is that you'll like these. I could be wrong but I'm thinking they could be the same.
BTW, The Roosebeck description is deceptive. They say "The G string is lighter gauge to allow for reentrant tuning." Yet both the G and A string are the same .028" diameter, just like with the T-2s.
EDIT NOTE: Hah! Dirk beat me by a minute.