Adequate - but not outstanding
First of all - the band only comes in large - so if you need a small you just have to deal with the excess length of the large and tuck it under.  This band is not made of the same stuff the actual fitbit bands are made of.  This band is harder - not quite as flexible I guess - and the edges get dirty quickly.  It doesn't wipe off or come clean well.  The fitbit itself fits nicely inside and the clasps work very well.  The colors are awesome and different than those that fitbit sells.  Overall it is an adequate and affordable replacement band but don't expect it to perform quite the same as the fitbit brand of bands.
Rating: 3 stars