I really really like TI strings. I used to be an endorser. I ran Powerbass on my Fender US Precision for my rock stuff and kept Superalloys on my Glaubs. I have had the flats on a number of bass but flats are not really my thing.
I stopped my endorsement after their third price hike within a set amount of time. I understand cost of material and what not but it got to be ridiculous. I can still get behind the flats because they last a long time so the cost equals out but the cost of their rounds are high as well. Superalloys are the cheapest they got and I don't think they are that much better than a comparable DR set or the Laklands.
I couldn't justify the cost so I switched the the Lakland nickels which I think are easily as good at a fraction of the cost.
(Note: I am a Curt Mangan endorser but only for the guitar strings really.)