I love Born Primitive Sports bras - they're a great combination of bright, fun colors/patterns, and functionality. I was nervous about going for a long run (12 mi) in one, but was pleased to experience no chafing (I did use some Body Glide, but I've done that and still had chafing with other bras in the past).
However, one point that I've noticed: The small vinyl logo on the inside of the bra causes my skin to break out in a small, localized rash. At first, I couldn't figure out why I had an itchy spot there - then I realized it coincided with wearing Born Primitive bras during the day (vice just during workouts). I'm not sure if anyone else has a similar issue, but is it possible to move that inside vinyl logo somewhere that it's not pressed directly against the breast? Over time, the logo wears off with multiple washings and ceases to be an issue, but that's the only issue I have with these great products.