As a end user I like the idea. Two questions around the choice of
increments, though.

If we're going to allow values up 99, why not include 100? To my mind,
reporting 0% -> 99% -> 100% offers about the same value as reporting
0% -> 100%.

Also, It seems to me that increments beyond 50 aren't really that
useful. For example, reporting 0% -> 75% -> 100% seems a bit odd to
me, even for extremely fast rebuilds. Units up to 50 (0%, 50%, 100%)
make more sense.


-- 
Drew

"Nothing in life is to be feared. It is only to be understood."
--Marie Curie