Whilst being silly at a rehearsal doing a two hands on neck tapping thing I got the worst blister ever from some flatwounds, so much so I had to use a pick at a gig that week. (Due to a historical hand injury I can barely hold a pick so that was interesting)
Anyhow, I digress.
I love the sound of flats these days, but I really dislike the tension, primarily because I find them impossible to bend a full tone. I tend to bend the strings a lot, god knows why, too much Sabbath as a kid I guess.
I'm interested in Colbalts, as I'd like a bit of top end on the thin strings but lots of fundemental note on the thick strings.
Fender flats play really well for me, they're not too stiff. La Bellas were an utter disaster, especially when it was humid. I did a jam night with them on my jazz and it was like playing a guitar covered in glue.
Once I get my P back from the repair man I'm very tempted to go back to flats, there's just something about a P with flats, a synergy if you will ;-)