no really. let me explain. as i think this is what causes all those haste debates.
FBSS is listed as 21% haste on the item itelf. however the way that percentages effects delays is as follows
old delay / (1 + haste percentage)
so if old delay was 100 (lousy but for illustration),let's look at the fbss
100 / (1 + 0.21)
or
100 / 1.21
or
82.3 %
meaning the delay is lowered about 17.7%. this is why some people say 21% on fbss and others say 18% - it is both depending on your persepctive.
now as to why haste isn't just percent delay lowered which would be clear i don't know. but here's a little conversion table
21% EQ haste = 17.8% reduction in delay
41% EQ haste = 29% reduction in delay
100% EQ haste = 50% reduction in delay
110% EQ haste = 52% reduction in delay