Not a great replacement for the original band mainly due to the clasp design - a double pin push connector thing. I find it pops off at the slightest nudge which is not great for an activity tracker. As a result I end up leaving the Fitbit on the kitchen bench or in my pocket at the gym.
Bought these for my wife, to replace the original Fitbit hand which had delaminated. She likes them better than the original, due to their "press fit" design. She loves the colour choices in this 8-pack!