I put the TIs on my Series 1 last night, and they sound and feel great! I actually used to have those strings on my bass, but then I switched over to Chromes. When I first got my Series 1, I experimented with many different strings to find the sound and feel I was looking for. I like the low tension of the TIs. For the music I play, flats work best for me on all of my Alembics. Guess it's my Phil Lesh influence coming through. Can't wait to play a gig with these strings.