So far, I've liked everything I've seen people write about these, and I'm thinking of getting some for my fretless, and I just wondered a couple of things. For one, how is the sustain, compared with your average flatwound strings? The other thing is tension. I've got the action set quite low on my bass, but will this cause problems with TI Flats, as they have a lower tension? Will I need to raise the action to stop buzzing or clacking? I don't know exactly what the strings on there at the moment are, they're flatwounds that the guy I bought it from already had on there, but I do know they're by Rotosound.